Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability

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• NewsExploited · CISA KEVMicrosoft · Windows

  Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability

  CVE-2026-21513

  Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.

  CISA's required action · due 3 Mar 2026 for U.S. federal civilian agencies

  Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  Cited by CISA: msrc.microsoft.com · nvd.nist.gov

  Added to KEV 10 Feb 2026 · Source checked 4 Nov 2026, 16:40 UTC · CISA KEV entry

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