CVE-2025-26633
KEVRansomware UseMicrosoft Windows Management Console (MMC) Improper Neutralization Vulnerability
Description
Microsoft Windows Management Console (MMC) contains an improper neutralization vulnerability that allows an unauthorized attacker to bypass a security feature locally.
Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature locally.
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HPublishedMar 11, 2025
Last modifiedSep 24, 2026
Added to KEVMar 11, 2025
Remediation dueApr 1, 2025
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26633Vendor Advisory
- vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-management-console-detection-scriptExploitThird Party Advisory
- vicarius.io/vsociety/posts/cve-2025-26633-security-feature-bypass-in-microsoft-management-console-mitigation-scriptExploitThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26633US Government Resource
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Risk assessment · High
Actively exploited and used by ransomware crews. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 573 days
- Ransomware
- Used in known ransomware campaigns
- CVSS
- 7.0 HIGH
- EPSS (30-day exploit probability)
- 30.4% · top 2% of all CVEs
- Weakness
- CWE-707
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
- 4.Verify offline/immutable backups and segment the affected systems. This flaw is used for ransomware initial access.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.