CVE-2026-88135: CWE-862: Missing Authorization in Microsoft Windows 10 Version 1607
Description
CVE-2026-88135 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 and related builds involving improper access control in the WebDAV service. This flaw allows an authorized local attacker to elevate privileges. The vulnerability affects multiple Windows 10 builds prior to specific patched versions. An official fix is available from Microsoft.
CVSS v3.1
Score 7.8high
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 11 Version 26H2
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
CVE-2026-88135 is a missing authorization vulnerability (CWE-862) in the WebDAV component of Microsoft Windows 10 Version 1607 and other related builds. It allows an attacker with local authorized access to escalate privileges due to improper access control. The vulnerability has a CVSS 3.1 base score of 7.8, indicating high severity, with impacts to confidentiality, integrity, and availability. Microsoft has released an official fix for this issue.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges on affected Windows 10 systems, potentially gaining higher-level access than intended. The impact includes full compromise of confidentiality, integrity, and availability of the affected system components.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected Windows 10 versions as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88135. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-09T21:53:00.397Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88135","vendor":"Microsoft"}]
Threat ID: 6ace855f2cdf04f6569ff8ff
Added to database: 10/13/2026, 19:24:15 UTC
Last enriched: 10/14/2026, 01:34:58 UTC
Last updated: 10/14/2026, 01:34:58 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.