Stack-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-69503
Published: September 8, 2026
Vulnerability identifier: #VU147752
CSH Severity: Medium
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69503
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to elevate privileges.
The vulnerability exists due to a stack-based buffer overflow in Windows USB Driver when processing crafted data over a network with user interaction. A remote user can send specially crafted data to elevate privileges.
Successful exploitation could result in SYSTEM privileges.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-69503
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7725, 10 22H2 10.0.19045.7725, 10 1809 10.0.17763.9245, 11 23H2 10.0.22631.7582, 11 24H2 10.0.26100.9445, 11 25H2 10.0.26200.9445, 11 26H1 10.0.28000.2954
Windows Server - addressed in versions 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438
Windows Server - addressed in versions 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438