Microsoft Windows: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
› Microsoft Windows
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- started
- Feb 10, 2026
- closed
- Feb 10, 2026
- CVEs
- 5
- sources
- 6
## summary
Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network. CISA added CVE-2026-21513, CVE-2026-21525, CVE-2026-21510, CVE-2026-21533, CVE-2026-21519 to the Known Exploited Vulnerabilities catalog on 2026-02-10 based on evidence of active exploitation.
severity: Actively exploited (CISA KEV)
## cve ids[5]
## affected
- See vendor advisory / CISA notes (versions not always listed in KEV feed)
## fixed in
- See vendor advisory linked in sources
## timeline[1]
CISA added CVE-2026-21513, CVE-2026-21525, CVE-2026-21510, CVE-2026-21533, CVE-2026-21519 to the KEV catalog (due 2026-03-03).
## advisories[6]
## notes & caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).
