Exploited vulnerability · CISA KEV

Is CVE-2025-26633 exploited? Yes: in CISA KEV since 11 Mar 2025

Gociux · Microsoft Windows · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-26633, Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Mar 2025, the day it was published. It is known to be used in ransomware campaigns. It affects Microsoft Windows. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

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

What to do

1. Check whether you run it. Look for Windows in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 11 Mar 2025.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Windows

• CVE-2026-96951: Microsoft Windows Command Injection Vulnerability (13 Oct 2026)
• CVE-2026-81963: Microsoft Windows Link Following Vulnerability (8 Sep 2026)
• CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability (8 Sep 2026)
• CVE-2008-4250: Microsoft Windows Buffer Overflow Vulnerability (20 May 2026)
• CVE-2026-32202: Microsoft Windows Protection Mechanism Failure Vulnerability (28 Apr 2026)
• CVE-2025-60710: Microsoft Windows Link Following Vulnerability (13 Apr 2026)

References

• msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-26633
• nvd.nist.gov/vuln/detail/CVE-2025-26633

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2025 · Microsoft scorecard · act-now radar.