CVE-2026-85884: CWE-306: Missing Authentication for Critical Function in Microsoft Windows 11 Version 24H2
Description
CVE-2026-85884 is a high-severity vulnerability in Microsoft Windows 11 Version 24H2 involving missing authentication for a critical function in the Windows Health and Optimized Experiences Service. This flaw allows an authorized local attacker to elevate privileges. The vulnerability affects specific builds of Windows 11 Version 24H2 prior to certain patched versions. 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 11 Version 26H2
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-85884) is classified as CWE-306 (Missing Authentication for Critical Function) and affects the Windows Health and Optimized Experiences Service in Windows 11 Version 24H2. It allows an attacker with local authorized access to elevate their privileges due to the lack of proper authentication on a critical function. The CVSS v3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, and privileges required as low. Microsoft has published an official fix for this issue.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges, potentially gaining higher-level access and control over the affected system. The impact includes high confidentiality, integrity, and availability consequences as per the CVSS vector.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is recommended to apply the available security updates as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85884. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:18:19.327Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85884","vendor":"Microsoft"}]
Threat ID: 6ace854a2cdf04f6569fec65
Added to database: 10/13/2026, 19:23:54 UTC
Last enriched: 10/14/2026, 02:49:44 UTC
Last updated: 10/14/2026, 02:49:44 UTC
Views: 2
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