CVE-2026-62775: CWE-863: Incorrect Authorization in Microsoft Windows 11 version 26H1
Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-62775) involves incorrect authorization in the Windows Container Isolation FS Filter Driver (unionfs.sys) in Windows 11 version 26H1 (build 10.0.28000.0). It allows an attacker with some level of authorization on the local system to disclose information that should otherwise be protected. The issue is classified under CWE-863 (Incorrect Authorization). Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker can exploit this vulnerability to disclose sensitive information. There is no impact on integrity or availability. The vulnerability does not require user interaction and has low attack complexity. No known exploits are reported in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 version 26H1 (build 10.0.28000.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62775.
CVE-2026-62775: CWE-863: Incorrect Authorization in Microsoft Windows 11 version 26H1
Description
Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-62775) involves incorrect authorization in the Windows Container Isolation FS Filter Driver (unionfs.sys) in Windows 11 version 26H1 (build 10.0.28000.0). It allows an attacker with some level of authorization on the local system to disclose information that should otherwise be protected. The issue is classified under CWE-863 (Incorrect Authorization). Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker can exploit this vulnerability to disclose sensitive information. There is no impact on integrity or availability. The vulnerability does not require user interaction and has low attack complexity. No known exploits are reported in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 version 26H1 (build 10.0.28000.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62775.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-14T21:04:04.256Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62775","vendor":"Microsoft"}]
Threat ID: 6a7b5815bf8831d539155ed9
Added to database: 08/11/2026, 17:12:53 UTC
Last enriched: 08/11/2026, 21:43:26 UTC
Last updated: 08/12/2026, 03:21:18 UTC
Views: 3
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.