CVE-2026-69594: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2
Description
CVE-2026-69594 is a heap-based buffer overflow vulnerability in the Microsoft Local Security Authority Server (lsasrv) component of Windows 11 Version 24H2. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity with a CVSS score of 7.8. An official fix is available from Microsoft.
CVSS v3.1
Score 7.8high
Affected software
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow in the lsasrv component of Microsoft Windows 11 Version 24H2. An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The flaw is tracked as CVE-2026-69594 and has a CVSS 3.1 base score of 7.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. This can compromise system confidentiality, integrity, and availability as indicated by the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 Version 24H2 to remediate this vulnerability. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69594 for detailed patch information and deployment guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:18:49.124Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69594","vendor":"Microsoft"}]
Threat ID: 6aa04514acd9273b49fa967e
Added to database: 09/08/2026, 17:25:40 UTC
Last enriched: 10/16/2026, 21:23:37 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 31
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