Input validation error in Microsoft Windows and Windows Server - CVE-2025-26633

Vulnerability identifier: #VU105518

CSH Severity: Critical

CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-26633

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input in Microsoft Management Console. A remote attacker can trick the victim into opening a specially crafted file and execute arbitrary code on the target system.

Note, the vulnerability is being actively exploited in the wild.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5608, 10 22H2 10.0.19045.5608, 10 1507 10.0.10240.20947, 10 1607 10.0.14393.7876, 10 1809 10.0.17763.7009, 11 22H2 10.0.22621.5039, 11 23H2 10.0.22631.5039, 11 24H2 10.0.26100.3403, 11 24H2 10.0.26100.3476
Windows Server - addressed in versions 2008 R2 6.1.7601.27618, 2008 6.0.6003.23168, 2012 R2 6.3.9600.22470, 2012 6.2.9200.25368, 2016 10.0.14393.7876, 2019 10.0.17763.7009, 2022 23H2 10.0.25398.1486, 2022 10.0.20348.3270, 2022 10.0.20348.3328, 2025 10.0.26100.3403, 2025 10.0.26100.3476

• Exploit #12160 - MSC-EvilTwin-Local-Privilege-Escalation (CVE-2025-26633 (CVSS 7.8) – Zero-day MMC .msc EvilTwin LPE actively exploited by Water Gamayun APT. PoC creates local admin via malicious MSC file on unpatched Windows 10/11/Server. Patched March 2025. Authorized t (November 28, 2025)
• Exploit #11305 - CVE-2025-26633 (April 11, 2025)

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-26633
• https://www.zerodayinitiative.com/advisories/ZDI-25-150/

• Remote code execution in Microsoft Management Console