CVE-2026-21513 - Microsoft Windows
AI Vulnerability ContextProtection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
Overview
A source-backed snapshot of this vulnerability.
CISA KEVyesWhether CISA lists this as exploited.
Techniques0AI attack methods connected to this vulnerability.
Case studies0Examples where this vulnerability is mentioned.
Vulnerability status
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CISA KEVHIGH
- CVE ID
- CVE-2026-21513
- Vendor/project
- Microsoft
- Product
- Windows
- Vulnerability name
- Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability
- Date added
- 2026-02-10
- Due date
- 2026-03-03
- Known ransomware campaign use
- Unknown
- CVSS v3
- 8.8
CWE-693
Exploit context
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No description available. The source record only contains identifiers and metadata.
Source evidence
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Original source
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NVD CVE pagehttps://nvd.nist.gov/vuln/detail/CVE-2026-21513CVE API docshttps://nvd.nist.gov/developers/vulnerabilitiesData feedshttps://nvd.nist.gov/vuln/data-feedsCataloghttps://www.cisa.gov/known-exploited-vulnerabilities-catalogData repositoryhttps://github.com/cisagov/kev-datasecure@microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-feature-bypass-vulnerability-in-mshtml-frameworkaf854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security-feature-bypass-vulnerability-in-mshtml-framework134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513