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CVE-2026-21513

MSHTML Framework Security Feature Bypass Vulnerability

Published
Last modified
published
Listed in CISA KEV
Fix
Fixed in 10.0.14393.8868, 10.0.17763.8389, 10.0.19044.6937, 10.0.19045.6937, 10.0.22631.6649, and 8 more
None on Exploit-DB, Metasploit or GitHub

Summary

The MSHTML Framework, a core Windows component used for rendering web content and HTML, is affected by this vulnerability. An unauthorized attacker on a network could exploit a flaw in its protection mechanism to bypass a security feature.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original description

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

Timeline

  1. Added to CISA KEV

    CISA has evidence of exploitation in the wild

  2. CVE published
  3. CISA remediation deadline

    Due date for US federal agencies to patch

  4. Record last updated
  5. EPSS reached 10%

    FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

  • Microsoft Windows 10 Version 1607

    From 10.0.14393.0 · fixed in 10.0.14393.8868

  • Microsoft Windows 10 Version 1809

    From 10.0.17763.0 · fixed in 10.0.17763.8389

  • Microsoft Windows 10 Version 21H2

    From 10.0.19044.0 · fixed in 10.0.19044.6937

  • Microsoft Windows 10 Version 22H2

    From 10.0.19045.0 · fixed in 10.0.19045.6937

  • Microsoft Windows 11 version 22H3

    From 10.0.22631.0 · fixed in 10.0.22631.6649

  • Microsoft Windows 11 Version 23H2

    From 10.0.22631.0 · fixed in 10.0.22631.6649

  • Microsoft Windows 11 Version 24H2

    From 10.0.26100.0 · fixed in 10.0.26100.7840

  • Microsoft Windows 11 Version 25H2

    From 10.0.26200.0 · fixed in 10.0.26200.7840

  • Microsoft Windows 11 version 26H1

    From 10.0.28000.0 · fixed in 10.0.28000.1575

  • Microsoft Windows 11 Version 26H1

    From 10.0.28000.0 · fixed in 10.0.28000.1575

  • Microsoft Windows Server 2012

    From 6.2.9200.0 · fixed in 6.2.9200.25923

  • Microsoft Windows Server 2012 (Server Core installation)

    From 6.2.9200.0 · fixed in 6.2.9200.25923

  • Microsoft Windows Server 2012 R2

    From 6.3.9600.0 · fixed in 6.3.9600.23022

  • Microsoft Windows Server 2012 R2 (Server Core installation)

    From 6.3.9600.0 · fixed in 6.3.9600.23022

  • Microsoft Windows Server 2016

    From 10.0.14393.0 · fixed in 10.0.14393.8868

  • Microsoft Windows Server 2016 (Server Core installation)

    From 10.0.14393.0 · fixed in 10.0.14393.8868

  • Microsoft Windows Server 2019

    From 10.0.17763.0 · fixed in 10.0.17763.8389

  • Microsoft Windows Server 2019 (Server Core installation)

    From 10.0.17763.0 · fixed in 10.0.17763.8389

  • Microsoft Windows Server 2022

    From 10.0.20348.0 · fixed in 10.0.20348.4773

  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

    From 10.0.25398.0 · fixed in 10.0.25398.2149

  • Microsoft Windows Server 2025

    From 10.0.26100.0 · fixed in 10.0.26100.32370

  • Microsoft Windows Server 2025 (Server Core installation)

    From 10.0.26100.0 · fixed in 10.0.26100.32370

References 1

msrc.microsoft.com