On 2025-03-11, CISA added CVE-2025-26633 (Microsoft Windows) to its Known Exploited Vulnerabilities (KEV) catalog [2]. The vulnerability is listed in the catalog as "Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability" [2]. CISA requires applying mitigations in accordance with vendor instructions; see the full text below for specific requirements [2].
Backfill: this event became public on Mar 11, 2025 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds Microsoft Windows Vulnerability CVE-2025-26633 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Mar 11, 2025
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 30.4%, higher than 98% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires applying mitigations in accordance with vendor instructions; see the full text for specific requirements [2].
Timeline
Technical details
CISA KEV Listing
On 2025-03-11, CISA added CVE-2025-26633 to the Known Exploited Vulnerabilities () catalog for Microsoft Windows [2].
Original Technical Description
Microsoft Windows Management Console (MMC) contains an improper neutralization vulnerability that allows an unauthorized attacker to bypass a security feature locally. [2]
Official Requirements
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]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2025-26633 [1].
References
Official / primary3
- [1]
“Improper neutralization in Microsoft Management Console allows an unauthorized attacker to bypass a security feature locally.”
- [2]CISA2025-03-11Accessed 2026-11-07
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.