CVE-2026-21523
published 2026-02-10CVE-2026-21523: Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
PriorityP351high8CVSS 3.1
AVNACLPRLUIRSUCHIHAH
EPSS
0.79%
52.0th percentile
Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_visual_studio_code_copilot_chat_extension | >= 0.27.0 < 0.37.1 | 0.37.1 |
| microsoft | visual_studio_code | < 1.109.2 | 1.109.2 |
| microsoft | visual_studio_code | >= 1.0.0 < 1.110.1 | 1.110.1 |
| msrc | microsoft_visual_studio_code_copilot_chat_extension | — | — |
| msrc | visual_studio_code | — | — |
CVSS provenance
nvdv3.18.0HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
vendor_msrc8.0HIGH
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Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos·2026-02-13
February’s Patch Tuesday assumes battle stations
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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
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
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-2026-21518 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.8
CVE-2026-21518 [HIGH] CVE-2026-21518 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21518 :
Visual Studio Code vulnerability analysis and mitigation
Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio Code 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
Affected Technologies
Visual Studio Code
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 12
Exploitation Probability (EPSS) N/A
Affected packages and libraries
cpe:2.3:a:microsoft:visual_studio_code
Sources
Linux Severity MEDIUM Has Fix Added at: Feb 11, 2026
Windows Severity MEDIUM Has Fix Added at: Feb 11, 2026
Linux Sever
Wiz
CVE-2026-21523 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.8
CVE-2026-21523 [HIGH] CVE-2026-21523 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21523 :
Visual Studio Code vulnerability analysis and mitigation
Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
Source : NVD
## 8
Score
Published February 10, 2026
Severity HIGH
CNA Score 8.0
Affected Technologies
Visual Studio Code
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 10.3
Exploitation Probability (EPSS) N/A
Affected packages and libraries
cpe:2.3:a:microsoft:visual_studio_code
Sources
Linux Severity HIGH Has Fix Added at: Feb 11, 2026
Windows Severity HIGH Has Fix Added at: Feb 11, 2026
Linux Severity HIGH Has Fix Added at: Feb 12, 2026
Windows Severity
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos
February’s Patch Tuesday assumes battle stations
Share This
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
2026-02-10
Published