Exploited vulnerability

CVE-2026-21513

TLP:CLEAR

Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability

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

Facts

Vendor: Microsoft
Product: Windows
CVSS: 8.8
EPSS (probability of exploitation within 30 days): 15.9 %
On CISA's Known Exploited Vulnerabilities list since: 10 February 2026
First known exploitation: 10 February 2026
CISA's deadline for US federal agencies: 3 March 2026
Weakness: CWE-693
First seen by Risk Letters: 10 February 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD