Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-03-11
• Known to be used in ransomware campaigns
• EPSS: 30% chance of exploitation in the next 30 days (higher than 98% of CVEs)

[ Description ]Official description

Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature locally.

CISA: Microsoft Windows Management Console (MMC) contains an improper neutralization vulnerability that allows an unauthorized attacker to bypass a security feature locally.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 1 Apr 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26633Vendor Advisory
• www.vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-mana…ExploitThird Party Advisory
• www.vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-mana…ExploitThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource