CVE-2026-20854
published 2026-01-13CVE-2026-20854: Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
PriorityP351high7.5CVSS 3.1
AVNACHPRLUINSUCHIHAH
EPSS
1.04%
60.3th percentile
Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_11_24h2 | < 10.0.26100.7623 | 10.0.26100.7623 |
| microsoft | windows_11_25h2 | < 10.0.26200.7623 | 10.0.26200.7623 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.7623 | 10.0.26100.7623 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.7623 | 10.0.26200.7623 |
| microsoft | windows_server_2025 | < 10.0.26100.32230 | 10.0.26100.32230 |
| microsoft | windows_server_2025 | >= 10.0.26100.0 < 10.0.26100.32230 | 10.0.26100.32230 |
| msrc | windows_11_version_24h2_for_arm64-based_systems | — | — |
| msrc | windows_11_version_24h2_for_x64-based_systems | — | — |
| msrc | windows_11_version_25h2_for_arm64-based_systems | — | — |
| msrc | windows_11_version_25h2_for_x64-based_systems | — | — |
| msrc | windows_server_2025 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_msrc7.5HIGH
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GHSA
GHSA-7g73-j999-7mq6: Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network
ghsa_unreviewed·2026-01-13
CVE-2026-20854 [HIGH] CWE-416 GHSA-7g73-j999-7mq6: Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network
Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
Microsoft
Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability
vendor_msrc·2026-01-13·CVSS 7.5
CVE-2026-20854 [HIGH] CWE-416 Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability
Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability
Description: Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
FAQ: How could an attacker exploit this vulnerability?
An attacker with the ability to modify certain directory attributes could provide crafted data that causes the system to reference invalid memory during authentication, potentially leading to a crash or other unintended behavior.
FAQ: According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?
Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges.
FAQ: According to the CVSS metric
No detection rules found.
No public exploits indexed.
Qualys
Microsoft and Adobe Patch Tuesday, January 2026 Security Update Review
blogs_qualys·2026-01-13
Microsoft and Adobe Patch Tuesday, January 2026 Security Update Review
## Table of Contents
Microsoft Patch Tuesday forJanuary2026
Adobe Patches for January 2026
Zero-day Vulnerabilities Patched inJanuaryPatch Tuesday Edition
Critical Severity Vulnerabilities Patched inJanuaryPatch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
Rapid Response with TruRisk Eliminate
EVALUATE Vendor-Suggested Mitigation withPolicy Audit(PA)
Qualys Monthly Webinar Series
Starting the year on a security-first note, Microsoft’s January 2026 Patch Tuesday resolves several vulnerabilities that could impact enterprise environments. Here’s a quick breakdown of what you need to know.
## Microsoft Patch Tuesday for January 2026
This month’s rel
Bleepingcomputer
Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
blogs_bleepingcomputer·2026-01-13·CVSS 5.5
[MEDIUM] Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
## Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
## Lawrence Abrams
57 Elevation of Privilege vulnerabilities
3 Security Feature Bypass vulnerabilities
22 Remote Code Execution vulnerabilities
22 Information Disclosure vulnerabilities
2 Denial of Service vulnerabilities
5 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 Microsoft Edge (1 flaw) and Mariner vulnerabilities fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5074109 & KB5073455 cumulative updates and Windows 10 KB5073724 extended security update .
## 3 zero-days, one ex
Talos
Microsoft Patch Tuesday for January 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-01-13·CVSS 5.5
CVE-2026-20805 [MEDIUM] Microsoft Patch Tuesday for January 2026 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for January 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for January 2026, which includes 112 vulnerabilities affecting a range of products, including 8 that Microsoft marked as “critical”.
In this month's release, Microsoft observed one of the included “important” vulnerabilities, CVE-2026-20805 , as being exploited in the wild. Out of 8 "critical" entries, 6 are remote code execution (RCE) vulnerabilities in Microsoft Windows services and applications including Windows Local Security Authority Subsystem Service (LSASS), Microsoft Word, Microsoft Excel, and Microsoft Office. The two remaining “critical” entries are elevation of privilege (EoP) vulnerabilities affecting Windows Graphic Component and Windows
Talos
Microsoft Patch Tuesday for January 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-01-13·CVSS 5.5
CVE-2026-20805 [MEDIUM] Microsoft Patch Tuesday for January 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for January 2026, which includes 112 vulnerabilities affecting a range of products, including 8 that Microsoft marked as “critical”.
In this month's release, Microsoft observed one of the included “important” vulnerabilities, CVE-2026-20805, as being exploited in the wild. Out of 8 "critical" entries, 6 are remote code execution (RCE) vulnerabilities in Microsoft Windows services and applications including Windows Local Security Authority Subsystem Service (LSASS), Microsoft Word, Microsoft Excel, and Microsoft Office. The two remaining “critical” entries are elevation of privilege (EoP) vulnerabilities affecting Windows Graphic Component and Windows Virtualization-Based Security (VBS) Enclave.
CVE-2026-20822 is a critical elevation of p
Qualys
Microsoft and Adobe Patch Tuesday, January 2026 Security Update Review | Qualys
blogs_qualys·2026-01-13
Microsoft and Adobe Patch Tuesday, January 2026 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday forJanuary2026
- Adobe Patches for January 2026
- Zero-day Vulnerabilities Patched inJanuaryPatch Tuesday Edition
- Critical Severity Vulnerabilities Patched inJanuaryPatch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
- Rapid Response with TruRisk Eliminate
- EVALUATE Vendor-Suggested Mitigation withPolicy Audit(PA)
- Qualys Monthly Webinar Series
Starting the year on a security-first note, Microsoft’s January 2026 Patch Tuesday resolves several vulnerabilities that could impact enterprise environments. Here’s a quick breakdown of what you need to know.
## Microsoft Patch Tuesday for January 2026
Thi
Wiz
CVE-2026-20854 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.5
CVE-2026-20854 [HIGH] CVE-2026-20854 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-20854 :
vulnerability analysis and mitigation
Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.
Source : NVD
## 7.5
Score
Published January 13, 2026
Severity HIGH
CNA Score 7.5
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) 21.2
Exploitation Probability (EPSS) 0.1
Sources
NVD
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Crowdstrike
January 2026 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] January 2026 Patch Tuesday: Updates and Analysis
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STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand AT
2026-01-13
Published