Main Vulnerability Database Vulnerabilities #VU131309

Untrusted Pointer Dereference in Microsoft Windows and Windows Server - CVE-2026-40369

Published: May 13, 2026 / Updated: May 15, 2026

Vulnerability identifier: #VU131309

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-40369

CWE-ID: CWE-822

Exploitation vector: Local access

Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a local user to escalate privileges the target system.

The vulnerability exists due to untrusted pointer dereference in Windows Kernel. A local user can gain elevated privileges on the system.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-40369

Install updates from vendor's website.

Microsoft Windows - addressed in versions 11 24H2 10.0.26100.8390, 11 24H2 10.0.26100.8457, 11 25H2 10.0.26200.8390, 11 25H2 10.0.26200.8457, 11 26H1 10.0.28000.2113
Windows Server - addressed in versions 2025 10.0.26100.32772, 2025 10.0.26100.32860

Links to Public Exploits and PoC-codes

Exploit #12711 - CVE-2026-40369-EXPLOIT (Full exploit code for CVE-2026-40369 - A Windows kernel arbitrary write vulnerability that allows browser sandbox escape from all browsers render process sandbox) (May 15, 2026)

External References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40369

Related Security Bulletins

Multiple vulnerabilities in Microsoft Windows Kernel