CVE-2026-20870: CWE-416: Use After Free in Microsoft Windows 11 Version 24H2
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20870) involves a use-after-free condition in the Windows Win32K ICOMP component on Windows 11 Version 24H2 (build 10.0.26100.0). Exploitation requires local access with some level of authorization and can lead to privilege escalation. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an authorized local attacker to elevate their privileges, potentially gaining higher-level access on the affected system. The vulnerability impacts confidentiality, integrity, and availability with high impact scores as per CVSS 3.1 metrics.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20870 to remediate this vulnerability.
CVE-2026-20870: CWE-416: Use After Free in Microsoft Windows 11 Version 24H2
Description
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20870) involves a use-after-free condition in the Windows Win32K ICOMP component on Windows 11 Version 24H2 (build 10.0.26100.0). Exploitation requires local access with some level of authorization and can lead to privilege escalation. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an authorized local attacker to elevate their privileges, potentially gaining higher-level access on the affected system. The vulnerability impacts confidentiality, integrity, and availability with high impact scores as per CVSS 3.1 metrics.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20870 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.382Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20870","vendor":"Microsoft"}]
Threat ID: 69668ae1a60475309f9ae163
Added to database: 01/13/2026, 18:11:45 UTC
Last enriched: 07/30/2026, 23:42:48 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 152
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