MSRC-CVE-2026-69348 — Windows Win32k Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Security updates
10.0.26100.33438 — https://support.microsoft.com/help/5122871
10.0.26200.9445 — https://support.microsoft.com/help/5124008
10.0.28000.2954 — https://support.microsoft.com/help/5124012

Vulnerabilities 1

High 7.8

CVE-2026-69348

Windows Win32k Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.

Microsoft Windows Server 2025 Windows Server 2025 (Server Core installation) Windows 11 Version 24H2 Windows

Sep 8, 2026

Revision history

2026-10-06 #2
Updated an acknowledgement. This is an informational change only.
2026-09-08 #1
Information published.

References

CVE-2026-69348 Windows Win32k Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69348
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss