CVE-2026-69276: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Windows 10 Version 1607
Description
CVE-2026-69276 is a critical integer underflow vulnerability in the Microsoft UxTheme Library (uxtheme.dll) affecting multiple versions of Windows 10, including Version 1607. This flaw allows an unauthorized attacker to execute code remotely over a network without user interaction or privileges. The vulnerability has a CVSS score of 9.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released official fixes for the affected versions.
CVSS v3.1
Score 9.8critical
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an integer underflow (wrap or wraparound) in the Microsoft UxTheme Library (uxtheme.dll) that enables remote code execution by an unauthorized attacker over a network. It affects multiple Windows 10 builds starting from version 1607 and later, with specific affected build ranges detailed. The flaw is identified as CWE-191 and has a critical CVSS 3.1 score of 9.8, reflecting its severity. Microsoft has issued official patches to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability allows an attacker to execute arbitrary code remotely without requiring privileges or user interaction, potentially leading to full system compromise. The impact includes complete loss of confidentiality, integrity, and availability of the affected systems.
Mitigation Recommendations
Microsoft has released official security updates that address this vulnerability. Users and administrators should apply these patches promptly to affected Windows 10 versions to mitigate the risk. No additional vendor-recommended mitigations are specified beyond applying the official fixes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:44:03.597Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69276","vendor":"Microsoft"}]
Threat ID: 6aa044ddacd9273b49fa7d75
Added to database: 09/08/2026, 17:24:45 UTC
Last enriched: 10/16/2026, 20:59:20 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 51
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