CVE-2026-21513

CVE Database · CVE-2026-21513

CVE-2026-21513

· HIGHAnalyzed

CVSS v3.1

8.8

EPSS

15.38%

Published

Feb 10, 2026

Modified

Mar 30, 2026

CISA Known Exploited Vulnerability

Added: 2026-02-10 · Due: 2026-03-03

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

Public PoC / Exploit (1)

All weaponized →

TrickestTrickest PoC index

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-693

Affected Products (23)

microsoft · windows_10_1607 (up to 10.0.14393.8868)vulnerable

microsoft · windows_10_1809 (up to 10.0.17763.8389)vulnerable

microsoft · windows_10_21h2 (up to 10.0.19044.6937)vulnerable

microsoft · windows_10_22h2 (up to 10.0.19045.6937)vulnerable

References (4)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513

Vendor Advisory

https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-feature-bypass-vulnerability-in-mshtml-framework

Third Party Advisory

https://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security-feature-bypass-vulnerability-in-mshtml-framework

MitigationThird Party Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513

US Government Resource

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