CVE-2026-21513

critical-risk
Published 2026-02-10

Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

Do I need to act?

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28.0% chance of exploitation in next 30 days
EPSS score — higher than 72% of all CVEs
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CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Microsoft

References (4)

Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513
Third Party Advisory https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-...
Mitigation https://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security...
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-...
73
/ 100
critical-risk
Severity 30/34 · Critical
Exploitability 22/34 · High
Exposure 21/34 · High