CVE-2026-69299: CWE-416: Use After Free in Microsoft Windows 10 Version 21H2
Description
CVE-2026-69299 is a use-after-free vulnerability in Microsoft COM on Windows 10 Version 21H2 that allows a local authorized attacker to elevate privileges. The vulnerability affects multiple builds of Windows 10 21H2 and related versions. An official fix is available from Microsoft.
CVSS v3.1
Score 7.0high
Affected software
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 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 a use-after-free condition in the Microsoft Component Object Model (COM) on Windows 10 Version 21H2. An authorized local attacker can exploit this flaw to elevate their privileges on the affected system. The vulnerability has a CVSS 3.1 base score of 7.0, indicating high severity, with attack vector local, high attack complexity, low privileges required, no user interaction, and impacts to confidentiality, integrity, and availability. Multiple specific Windows 10 builds are affected, and 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.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69299 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:46:07.440Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69299","vendor":"Microsoft"}]
Threat ID: 6aa044e1acd9273b49fa7ddf
Added to database: 09/08/2026, 17:24:49 UTC
Last enriched: 10/16/2026, 21:01:21 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 28
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