CVE-2026-21513
published 2026-02-10CVE-2026-21513: Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
PriorityP187high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
KEVITW
CISA Known Exploited Vulnerabilitydue 2026-03-03
Exploited in the wild
EPSS
15.38%
96.4th percentile
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
Affected
42 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.8868 | 10.0.14393.8868 |
| microsoft | windows_10_1809 | < 10.0.17763.8389 | 10.0.17763.8389 |
| microsoft | windows_10_21h2 | < 10.0.19044.6937 | 10.0.19044.6937 |
| microsoft | windows_10_22h2 | < 10.0.19045.6937 | 10.0.19045.6937 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.8868 | 10.0.14393.8868 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.8389 | 10.0.17763.8389 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.6937 | 10.0.19044.6937 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.6937 | 10.0.19045.6937 |
| microsoft | windows_11_23h2 | < 10.0.22631.6649 | 10.0.22631.6649 |
| microsoft | windows_11_24h2 | < 10.0.26100.7781 | 10.0.26100.7781 |
| microsoft | windows_11_25h2 | < 10.0.26200.7781 | 10.0.26200.7781 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.6649 | 10.0.22631.6649 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.6649 | 10.0.22631.6649 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.7840 | 10.0.26100.7840 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.7840 | 10.0.26200.7840 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.1575 | 10.0.28000.1575 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25923 | 6.2.9200.25923 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.23022 | 6.3.9600.23022 |
| microsoft | windows_server_2016 | < 10.0.14393.8868 | 10.0.14393.8868 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.8868 | 10.0.14393.8868 |
| microsoft | windows_server_2019 | < 10.0.17763.8389 | 10.0.17763.8389 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.8389 | 10.0.17763.8389 |
| microsoft | windows_server_2022 | < 10.0.20348.4711 | 10.0.20348.4711 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.4773 | 10.0.20348.4773 |
Detection & IOCsextracted from sources · hover to see the quote
- →Hunt for LNK files that contain embedded HTML content (iframes, ActiveX htmlfile objects) immediately following the standard LNK binary structure — a strong indicator of CVE-2026-21513 exploitation. ↗
- →Monitor for outbound SMB/WebDAV connections initiated by Office applications (e.g., triggered by RTF documents with embedded OLE objects referencing CLSID EAB22AC3-30C1-11CF-A7EB-0000C05BAE0B) as part of the CVE-2026-21509 → CVE-2026-21513 two-stage chain. ↗
- →The exploit triggers ShellExecuteExW via the vulnerable MSHTML hyperlink navigation code path; monitor for ShellExecuteExW calls originating from ieframe.dll / MSHTML-hosted processes with remote or UNC-path targets. ↗
- →Spear-phishing lures for this campaign use subject lines related to 'Hydro-meteorological Warnings,' 'Invitation to Military Training Program,' or 'Weapon Smuggling Alerts' — use these as email gateway detection strings. ↗
- →PrismexStager abuses Filen.io cloud storage for C2; monitor for unexpected outbound connections to filen.io from endpoints, especially from processes associated with .NET implants. ↗
- →The APT28 campaign uses COM DLL hijacking for persistence; hunt for unexpected DLL loads in COM server registry paths and scheduled tasks created by PrismexDrop. ↗
- ·The linkage between CVE-2026-21509 and CVE-2026-21513 as a confirmed two-stage chain has NOT been independently verified by Trend Micro Research — it is inferred from shared C&C infrastructure (wellnesscaremed[.]com) identified by Akamai. ↗
- ·While the primary observed delivery is malicious LNK files, the CVE-2026-21513 vulnerable code path can be triggered by any component embedding MSHTML, so detection should not be limited to LNK-based phishing. ↗
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vulncheck8.8HIGH
cisa8.8HIGH
vendor_msrc8.8HIGH
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CISA
Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
cisa·2026-02-10·CVSS 8.8
CVE-2026-21513 [HIGH] CWE-693 Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Vulnerability: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Affected: Microsoft Windows
Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://msrc.microsoft.com/update-guide/advisory/CVE-2026-21513 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21513
Remediation Due Date: 2026-03-03
Microsoft
MSHTML Framework Security Feature Bypass Vulnerability
vendor_msrc·2026-02-10·CVSS 8.8
CVE-2026-21513 [HIGH] CWE-693 MSHTML Framework Security Feature Bypass Vulnerability
MSHTML Framework Security Feature Bypass Vulnerability
Description: Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
FAQ: According to the CVSS metric, the attack vector is user interaction is required (UI:R). How could an attacker exploit this security feature bypass vulnerability?
An attacker could exploit this vulnerability by convincing a user to open a malicious HTML file or shortcut (.lnk) file delivered through a link, email attachment, or download. The specially crafted file manipulates browser and Windows Shell handling, causing the content to be executed by the operating system. This allows the attacker to bypass security features and potentially achieve code execution.
FAQ: What kind of security feat
GHSA
GHSA-rqf6-jf48-p6rm: Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network
ghsa_unreviewed·2026-02-10
CVE-2026-21513 [HIGH] CWE-693 GHSA-rqf6-jf48-p6rm: Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
VulnCheck
Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
vulncheck·2026·CVSS 8.8
CVE-2026-21513 [HIGH] CWE-693 Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
Affected: Microsoft Windows
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Exploitation References: https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Feb; https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit; https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513; https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json; https://www.akamai.co
No detection rules found.
No public exploits indexed.
Hackernews
Exposed Server Reveals AI-Assisted Phishing Toolkit Behind WebDAV Malware Campaign
blogs_hackernews·2026-07-20·CVSS 5.4
CVE-2025-33053 [MEDIUM] Exposed Server Reveals AI-Assisted Phishing Toolkit Behind WebDAV Malware Campaign
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## Exposed Server Reveals AI-Assisted Phishing Toolkit Behind WebDAV Malware Campaign
A malware operator left its delivery server wide open, and Rapid7 pulled down the whole toolkit: 1,048 files spanning lure templates, filename-spoofing tests, execution experiments, droppers, builder notes, and two campaign chains. One was already live against Windows users in Mexico, delivering an infostealer through a fake government ID-lookup site over WebDAV.
What makes it more than a payload dump: it caught the operation mid-build. Testing notes, failed experiments, documentation, and live delivery logs sat in one place, the kind of compl
Rapid7
From a Single Alert to 1,000 Files: Inside an Exposed WebDAV Malware Delivery Lab
blogs_rapid7·2026-07-20
CVE-2025-33053 From a Single Alert to 1,000 Files: Inside an Exposed WebDAV Malware Delivery Lab
## Executive summary
An MDR alert recently led our team to an exposed server that was doing more than hosting payloads. It was functioning as a fully operational malware delivery lab. Containing over 1,000 artifacts, the infrastructure served as a QA hub where attackers systematically tested delivery paths, social engineering lures, and WebDAV execution methods.
Our analysis reveals an interesting shift in adversary operations: attackers are adopting generative AI to move beyond individual exploits and operate like modern software product teams. By leveraging LLMs for rapid lure generation, detailed README documentation, and automated testing, they are significantly accelerating their development cycle.
This incident underscores the imperative of preemptive security. By unifying exposur
Recorded Future
June 2026 CVE Landscape
blogs_recorded_future·2026-07-10·CVSS 9.1
CVE-2026-35616 [CRITICAL] June 2026 CVE Landscape
## June 2026 CVE Landscape
In June 2026, Insikt Group® identified 60 high-impact vulnerabilities that should be prioritized for remediation , 30 of which had a Very Critical Recorded Future Risk Score. This represents a 49% increase from last month. 23 of the 60 vulnerabilities were included in the US Cybersecurity and Infrastructure Security Agency (CISA)’s Known Exploited Vulnerabilities (KEV) catalog, 34 were reported by vendors, and three were primarily surfaced through honeypot data.
The 60 vulnerabilities in this report affected products from 36 vendors, with Microsoft accounting for approximately 18% of the vulnerabilities. The remaining exposure was concentrated across a range of enterprise software, security products, network infrastructure, developer tooling, and cloud platform
Tenable
Inside the customer environment: Where threat actors, vulnerabilities, and exposed assets intersect
blogs_tenable·2026-05-27
CVE-2023-4966 Inside the customer environment: Where threat actors, vulnerabilities, and exposed assets intersect
## Exposure Management
## Explore By Use Case
## Explore By Industry
## Tenable is the one clear leader in Exposure Management
## Exposure management
resource center
## Accelerate your exposure management strategy with practical resources and tools.
## Explore By Use Case
## Explore By Industry
## Tenable is the one clear leader in Exposure Management
## Exposure management
resource center
## Accelerate your exposure management strategy with practical resources and tools.
## Inside the customer environment: Where threat actors, vulnerabilities, and exposed assets intersect
Tenable Research has developed a graph-based model linking 600+ threat groups to real-world customer exposures. It reveals which vulnerabilities sit at the intersection of severity, active exploit
Securelist
Exploits and vulnerabilities in Q1 2026
blogs_securelist·2026-05-07·CVSS 7.8
CVE-2026-21519 [HIGH] Exploits and vulnerabilities in Q1 2026
Alexander Kolesnikov
Table of Contents
Statistics on registered vulnerabilities
Exploitation statistics
Windows and Linux vulnerability exploitation
Most common published exploits
Vulnerability exploitation in APT attacks
C2 frameworks
Notable vulnerabilities
CVE-2026-21519: Desktop Window Manager vulnerability
RegPwn (CVE-2026-21533): a system settings access control vulnerability
CVE-2026-21514: a Microsoft Office vulnerability
Clawdbot (CVE-2026-25253): an OpenClaw vulnerability
CVE-2026-34070: LangChain framework vulnerability
CVE-2026-22812: an OpenCode vulnerability
Conclusion and advice
Authors
Alexander Kolesnikov
During Q1 2026, the exploit kits leveraged by threat actors to target user systems expanded once again, incorporating new exploits for the Microsoft Off
Hackernews
CISA Adds Actively Exploited ConnectWise and Windows Flaws to KEV
blogs_hackernews·2026-04-29·CVSS 8.4
CVE-2024-1708 [HIGH] CISA Adds Actively Exploited ConnectWise and Windows Flaws to KEV
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## CISA Adds Actively Exploited ConnectWise and Windows Flaws to KEV
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added two security flaws impacting ConnectWise ScreenConnect and Microsoft Windows to its Known Exploited Vulnerabilities ( KEV ) catalog, based on evidence of active exploitation.
The vulnerabilities are listed below -
CVE-2024-1708 (CVSS score: 8.4) - A path traversal vulnerability in ConnectWise ScreenConnect that could allow an attacker to execute remote code or directly impact confidential data and critical systems. (Fixed in February 2024)
CVE-2026-32202 (CVSS score: 4.3) - A p
Hackernews
Microsoft Confirms Active Exploitation of Windows Shell CVE-2026-32202
blogs_hackernews·2026-04-28·CVSS 8.8
CVE-2026-32202 [HIGH] Microsoft Confirms Active Exploitation of Windows Shell CVE-2026-32202
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## Microsoft Confirms Active Exploitation of Windows Shell CVE-2026-32202
Microsoft on Monday revised its advisory for a now-patched, high-severity security flaw impacting Windows Shell to acknowledge that it has been actively exploited in the wild.
The vulnerability in question is CVE-2026-32202 (CVSS score: 4.3), a spoofing vulnerability that could allow an attacker to access sensitive information. It was addressed as part of its Patch Tuesday update for this month.
"Protection mechanism failure in Windows Shell allows an unauthorized attacker to perform spoofing over a network," Microsoft noted in an alert. "An attacker wou
Hackernews
APT28 Deploys PRISMEX Malware in Campaign Targeting Ukraine and NATO Allies
blogs_hackernews·2026-04-08·CVSS 7.8
[HIGH] APT28 Deploys PRISMEX Malware in Campaign Targeting Ukraine and NATO Allies
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## APT28 Deploys PRISMEX Malware in Campaign Targeting Ukraine and NATO Allies
The Russian threat actor known as APT28 (aka Forest Blizzard and Pawn Storm) has been linked to a fresh spear-phishing campaign targeting Ukraine and its allies to deploy a previously undocumented malware suite codenamed PRISMEX .
"PRISMEX combines advanced steganography, component object model (COM) hijacking, and legitimate cloud service abuse for command-and-control," Trend Micro researchers Feike Hacquebord and Hiroyuki Kakara said in a technical report. The campaign is believed to be active since at least September 2025.
The activity has target
abuse.ch
ThreatFox Malware Profile: Unidentified 001
abuse_ch·2026-04-03
CVE-2026-21513 ThreatFox Malware Profile: Unidentified 001
Malware Family: Unidentified 001
Internal name: win.unidentified_001
ThreatFox has tracked 10 indicators of compromise for this malware family.
Activity observed from 2026-03-30 to 2026-04-03.
Threat categories: botnet command-and-control server (6 IOCs); malicious payload (4 IOCs)
Indicator types: IP address and port (4); SHA-256 file hash (4); domain name (2)
Associated tags: c2 (2), None (2), staging (1), cpl (1), mitm (1), cve-2026-21513 (1), cve-2011-3230 (1), cloudflare (1)
Trendmicro
Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
blogs_trendmicro·2026-03-26·CVSS 7.8
[HIGH] Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
APT y ataques dirigidos
## Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
This blog discusses the steganography, cloud abuse, and email-based backdoors used against the Ukrainian defense supply chain in the latest Pawn Storm campaign that TrendAI™ Research observed and analyzed.
By: Feike Hacquebord, Hiroyuki Kakara Mar 26, 2026 Read time: ( words)
Save to Folio
Key takeaways:
Prolific Russia-aligned Advanced Persistent Threat (APT) group Pawn Storm has been using PRISMEX, a collection of interconnected malware components to target the defense supply chain of Ukraine and its allies including Czech Republic, Poland, Romania, Slovakia, Slovenia, and Turkey.
PRISMEX combines advanced steganography, component object model (COM) hijacking, an
Trendmicro
Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
blogs_trendmicro·2026-03-26·CVSS 7.8
[HIGH] Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
APT & Targeted Attacks
## Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
This blog discusses the steganography, cloud abuse, and email-based backdoors used against the Ukrainian defence supply chain in the latest Pawn Storm campaign that TrendAI™ Research observed and analysed.
By: Feike Hacquebord, Hiroyuki Kakara Mar 26, 2026 Read time: ( words)
Save to Folio
Key takeaways:
Prolific Russia-aligned Advanced Persistent Threat (APT) group Pawn Storm has been using PRISMEX, a collection of interconnected malware components to target the defence supply chain of Ukraine and its allies including Czech Republic, Poland, Romania, Slovakia, Slovenia, and Turkey.
PRISMEX combines advanced steganography, component object model (COM) hijacking, and
Trendmicro
Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
blogs_trendmicro·2026-03-26·CVSS 7.8
[HIGH] Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
APT und gezielte Angriffe
## Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
This blog discusses the steganography, cloud abuse, and email-based backdoors used against the Ukrainian defense supply chain in the latest Pawn Storm campaign that TrendAI™ Research observed and analyzed.
By: Feike Hacquebord, Hiroyuki Kakara Mar 26, 2026 Read time: ( words)
Save to Folio
Key takeaways:
Prolific Russia-aligned Advanced Persistent Threat (APT) group Pawn Storm has been using PRISMEX, a collection of interconnected malware components to target the defense supply chain of Ukraine and its allies including Czech Republic, Poland, Romania, Slovakia, Slovenia, and Turkey.
PRISMEX combines advanced steganography, component object model (COM) hijacking,
Trendmicro
Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
blogs_trendmicro·2026-03-26·CVSS 7.8
[HIGH] Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
APT & Targeted Attacks
## Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
This blog discusses the steganography, cloud abuse, and email-based backdoors used against the Ukrainian defense supply chain in the latest Pawn Storm campaign that TrendAI™ Research observed and analyzed.
By: Feike Hacquebord, Hiroyuki Kakara Mar 26, 2026 Read time: ( words)
Save to Folio
Key takeaways:
Prolific Russia-aligned Advanced Persistent Threat (APT) group Pawn Storm has been using PRISMEX, a collection of interconnected malware components to target the defense supply chain of Ukraine and its allies including Czech Republic, Poland, Romania, Slovakia, Slovenia, and Turkey.
PRISMEX combines advanced steganography, component object model (COM) hijacking, and
Trendmicro
Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
blogs_trendmicro·2026-03-26·CVSS 7.8
[HIGH] Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
APT & Targeted Attacks
## Pawn Storm Campaign Deploys PRISMEX, Targets Government and Critical Infrastructure Entities
This blog discusses the steganography, cloud abuse, and email-based backdoors used against the Ukrainian defense supply chain in the latest Pawn Storm campaign that TrendAI™ Research observed and analyzed.
By: Feike Hacquebord, Kakara Hiroyuki 2026/03/26 Read time: ( words)
Save to Folio
Key takeaways:
Prolific Russia-aligned Advanced Persistent Threat (APT) group Pawn Storm has been using PRISMEX, a collection of interconnected malware components to target the defense supply chain of Ukraine and its allies including Czech Republic, Poland, Romania, Slovakia, Slovenia, and Turkey.
PRISMEX combines advanced steganography, component object model (COM) hijacking, and l
Tenable
Operation Epic Fury: Why exposure data changes everything about Iran's cyber-kinetic campaign
blogs_tenable·2026-03-17
Operation Epic Fury: Why exposure data changes everything about Iran's cyber-kinetic campaign
## Cloud Exposure
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Tenable
Operation Epic Fury: cyber threat data in the Iran War
blogs_tenable·2026-03-17·CVSS 7.8
[HIGH] Operation Epic Fury: cyber threat data in the Iran War
Blog / Cyber Exposure Alerts
Subscribe
# Operation Epic Fury: Why exposure data changes everything about Iran's cyber-kinetic campaign
Robert Huber
March 17, 2026
13 Min Read
Iran's retaliatory campaign following Operation Epic Fury has collapsed the boundary between physical and digital warfare. Tenable's exposure data analysis across seven target countries reveals that the largest exploitable attack surface isn't the headline threat, it's a Microsoft Word N-day affecting nearly 14 million assets.
## Key takeaways:
1. Exposure data rebalances the threat picture. A Microsoft Word N-day (CVE-2026-21514) accounts for nearly 14 million of the 15.5 million affected assets across the seven target countries, two orders of magnitude more than the conflict's headline threats. Organizations
Recorded Future
February 2026 CVE Landscape: 13 Critical Vulnerabilities Mark 43% Drop from January
blogs_recorded_future·2026-03-12·CVSS 7.7
[HIGH] February 2026 CVE Landscape: 13 Critical Vulnerabilities Mark 43% Drop from January
## February 2026 CVE Landscape:13 Critical Vulnerabilities Mark 43% Drop from January
February 2026 saw a 43% decrease in high-impact vulnerabilities, with Recorded Future's Insikt Group® identifying 13 vulnerabilities requiring immediate remediation, down from 23 in January 2026 . All 13 carried a ‘Very Critical’ Recorded Future Risk Score.
What security teams need to know:
Microsoft dominates: Six of 13 vulnerabilities affected Microsoft products, accounting for 46% of February's findings; all were added to CISA's KEV catalog on the same day
Supply-chain attack on Notepad++: Lotus Blossom, a suspected China state-sponsored threat actor, exploited CVE-2025-15556 to hijack Notepad++'s update channel and deliver a Cobalt Strike Beacon and the Chrysalis backdoor
APT28 exploits MSHTML fl
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos·2026-02-13
February’s Patch Tuesday assumes battle stations
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Qualys
Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review
blogs_qualys·2026-02-10
Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review
## Table of Contents
Microsoft Patch Tuesday forFebruary2026
Adobe Patches for February 2026
Zero-day Vulnerabilities Patched inFebruaryPatch Tuesday Edition
Critical Severity Vulnerabilities Patched inFebruaryPatch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
Rapid Response with TruRisk Eliminate
Qualys Monthly Webinar Series
Microsoft’s February 2026 Patch Tuesday focuses on closing security gaps that attackers could exploit, reinforcing the importance of timely patching in enterprise environments. Here’s a quick breakdown of what you need to know.
## Microsoft Patch Tuesday for February 2026
This month’s release addresses 61 vulnerabilities, i
Bleepingcomputer
Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
blogs_bleepingcomputer·2026-02-10·CVSS 8.8
[HIGH] Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
## Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
## Lawrence Abrams
25 Elevation of Privilege vulnerabilities
5 Security Feature Bypass vulnerabilities
12 Remote Code Execution vulnerabilities
6 Information Disclosure vulnerabilities
3 Denial of Service vulnerabilities
7 Spoofing vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include 3 Microsoft Edge flaws fixed earlier this month.
As part of these updates, Microsoft has also begun to roll out updated Secure Boot certificates to replace the original 2011 certificates that are expiring in late June 2026.
"With this update, Windows quality updates include a broad set of targeting data that i
Krebs
Patch Tuesday, February 2026 Edition
blogs_krebs·2026-02-10·CVSS 7.8
CVE-2026-21510 [HIGH] Patch Tuesday, February 2026 Edition
Microsoft today released updates to fix more than 50 security holes in its Windows operating systems and other software, including patches for a whopping six “zero-day” vulnerabilities that attackers are already exploiting in the wild.
Zero-day #1 this month is CVE-2026-21510, a security feature bypass vulnerability in Windows Shell wherein a single click on a malicious link can quietly bypass Windows protections and run attacker-controlled content without warning or consent dialogs. CVE-2026-21510 affects all currently supported versions of Windows.
The zero-day flaw CVE-2026-21513 is a security bypass bug targeting MSHTML, the proprietary engine of the default Web browser in Windows. CVE-2026-21514 is a related security feature bypass in Microsoft Word.
The zero-day CVE-2026-21533 all
Talos
Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-02-10·CVSS 8.8
CVE-2026-21522 [HIGH] Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for February 2026, which includes 59 vulnerabilities affecting a range of products, including two that Microsoft marked as “Critical”.
CVE-2026-21522 is a critical elevation of privilege vulnerability affecting Microsoft ACI Confidential Containers. Successful exploitation of this vulnerability could enable an authorized attacker to escalate privileges on affected systems. This vulnerability is not listed as publicly disclosed and received a CVSS 3.1 score of 6.7.
CVE-2026-23655 is a critical information disclosure vulnerability affecting Microsoft ACI Confidential Containers. This vulnerability could enable an authorized attacker to disclose sensit
Qualys
Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review | Qualys
blogs_qualys·2026-02-10
Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday forFebruary2026
- Adobe Patches for February 2026
- Zero-day Vulnerabilities Patched inFebruaryPatch Tuesday Edition
- Critical Severity Vulnerabilities Patched inFebruaryPatch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
- Rapid Response with TruRisk Eliminate
- Qualys Monthly Webinar Series
Microsoft’s February 2026 Patch Tuesday focuses on closing security gaps that attackers could exploit, reinforcing the importance of timely patching in enterprise environments. Here’s a quick breakdown of what you need to know.
## Microsoft Patch Tuesday for February 2026
This month’s release addresses 61 vulner
Krebs
Patch Tuesday, February 2026 Edition
blogs_krebs·2026-02-10·CVSS 7.8
CVE-2026-21510 [HIGH] Patch Tuesday, February 2026 Edition
Microsoft today released updates to fix more than 50 security holes in its Windows operating systems and other software, including patches for a whopping six “zero-day” vulnerabilities that attackers are already exploiting in the wild.
Zero-day #1 this month is CVE-2026-21510 , a security feature bypass vulnerability in Windows Shell wherein a single click on a malicious link can quietly bypass Windows protections and run attacker-controlled content without warning or consent dialogs. CVE-2026-21510 affects all currently supported versions of Windows.
The zero-day flaw CVE-2026-21513 is a security bypass bug targeting MSHTML , the proprietary engine of the default Web browser in Windows. CVE-2026-21514 is a related security feature bypass in Microsoft Word.
The zero-day CVE-2026-21533 a
Tenable
February 2026 Microsoft Patch Tuesday | Tenable®
blogs_tenable·2026-02-10
February 2026 Microsoft Patch Tuesday | Tenable®
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Talos
Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-02-10·CVSS 8.8
CVE-2026-21522 [HIGH] Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for February 2026, which includes 59 vulnerabilities affecting a range of products, including two that Microsoft marked as “Critical”.
CVE-2026-21522 is a critical elevation of privilege vulnerability affecting Microsoft ACI Confidential Containers. Successful exploitation of this vulnerability could enable an authorized attacker to escalate privileges on affected systems. This vulnerability is not listed as publicly disclosed and received a CVSS 3.1 score of 6.7.
CVE-2026-23655 is a critical information disclosure vulnerability affecting Microsoft ACI Confidential Containers. This vulnerability could enable an authorized attacker to disclose sensitive information including secret tokens and keys if successfully exploited. This vulnerabi
Wiz
CVE-2026-21513 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.8
CVE-2026-21513 [HIGH] CVE-2026-21513 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21513 :
vulnerability analysis and mitigation
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
Source : NVD
## 8.8
Score
Published February 10, 2026
Severity HIGH
CNA Score 8.8
Has Public Exploit Yes
Has CISA KEV Exploit Yes
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 96.5
Exploitation Probability (EPSS) 28
Sources
NVD
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Recorded Future
February 2026 CVE Landscape: 13 Critical Vulnerabilities Mark 43% Drop from January
blogs_recorded_future·CVSS 7.7
[HIGH] February 2026 CVE Landscape: 13 Critical Vulnerabilities Mark 43% Drop from January
# February 2026 CVE Landscape:13 Critical Vulnerabilities Mark 43% Drop from January
February 2026 saw a 43% decrease in high-impact vulnerabilities, with Recorded Future's Insikt Group® identifying 13 vulnerabilities requiring immediate remediation, down from 23 in January 2026. All 13 carried a ‘Very Critical’ Recorded Future Risk Score.
What security teams need to know:
- Microsoft dominates: Six of 13 vulnerabilities affected Microsoft products, accounting for 46% of February's findings; all were added to CISA's KEV catalog on the same day
- Supply-chain attack on Notepad++: Lotus Blossom, a suspected China state-sponsored threat actor, exploited CVE-2025-15556 to hijack Notepad++'s update channel and deliver a Cobalt Strike Beacon and the Chrysalis backdoor
- APT28 exploits MSHTML
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos
February’s Patch Tuesday assumes battle stations
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Microsoft on Tuesday released 58 patches affecting 15 product families. Five of the addressed issues, all involving Azure, are considered by Microsoft to be of Critical severity, though only two require urgent attention (more on that below). Fifteen have a CVSS base score of 8.0 or higher, including two with a 9.8 base score. Six are known to be under active exploit in the wild, and three are publicly disclosed (including one not yet known to be under exploit).
At patch time, five CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation, in addition to the six already detected to be so. Various of this month’s issues are amenable to direct detection by Sophos protections, and we include information on those in a table below. The release also
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-feature-bypass-vulnerability-in-mshtml-frameworkhttps://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security-feature-bypass-vulnerability-in-mshtml-frameworkhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513
2026-02-10
Published
2026-02-10
Added to CISA KEV
Exploited in the wild