CVE-2026-21513
Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
CVSS
—
No CVSS
EPSS
15.9%
p97
KEV
YES
Feb 10, 2026
Exploit Today
79
0-100
Published: — · Last modified: —
Product
Microsoft / Windows
Vulnerability
Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
Added to KEV
Feb 10, 2026
Remediate by
Mar 3, 2026
Known ransomware use
No
Summary description
Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/advisory/CVE-2026-21513 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21513