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CVE-2026-21513CISA KEV

Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability

CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.

CISA KEV Check MSRC

CISA catalog record

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

Product
Windows
Added to KEV
10 Feb 2026
Federal remediation due
3 Mar 2026
Known ransomware use
Not reported
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