CVE-2026-61939: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Use after free in Winlogon allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-416 (Use After Free), exists in the Winlogon process of Windows 10 Version 1607 (build 10.0.14393.0). It allows a local attacker with authorized access to exploit the use-after-free condition to elevate their privileges. The vulnerability has been assigned CVE-2026-61939 and has a CVSS 3.1 base score of 7.0, indicating high severity. Microsoft has published an official fix to remediate this issue. No known exploits are currently reported in the wild.
Potential Impact
An authorized local attacker can leverage this use-after-free vulnerability in Winlogon to elevate their privileges, potentially gaining higher-level access than intended. This could lead to full system compromise depending on the privileges escalated to. The vulnerability affects confidentiality, integrity, and availability as indicated by the CVSS vector.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the provided security update from the Microsoft Security Response Center to remediate the issue. Since an official patch is available, applying this update is the recommended mitigation. No additional vendor guidance indicates other mitigations or that no action is required.
CVE-2026-61939: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
Use after free in Winlogon allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.0high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-416 (Use After Free), exists in the Winlogon process of Windows 10 Version 1607 (build 10.0.14393.0). It allows a local attacker with authorized access to exploit the use-after-free condition to elevate their privileges. The vulnerability has been assigned CVE-2026-61939 and has a CVSS 3.1 base score of 7.0, indicating high severity. Microsoft has published an official fix to remediate this issue. No known exploits are currently reported in the wild.
Potential Impact
An authorized local attacker can leverage this use-after-free vulnerability in Winlogon to elevate their privileges, potentially gaining higher-level access than intended. This could lead to full system compromise depending on the privileges escalated to. The vulnerability affects confidentiality, integrity, and availability as indicated by the CVSS vector.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the provided security update from the Microsoft Security Response Center to remediate the issue. Since an official patch is available, applying this update is the recommended mitigation. No additional vendor guidance indicates other mitigations or that no action is required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-13T04:47:32.464Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61939","vendor":"Microsoft"}]
Threat ID: 6a7b5808bf8831d5391559b0
Added to database: 08/11/2026, 17:12:40 UTC
Last enriched: 08/11/2026, 22:41:24 UTC
Last updated: 08/12/2026, 00:12:10 UTC
Views: 3
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