🔐 CVE Alert

CVE-2026-21513

HIGH 8.8 ⚠️ CISA KEV

MSHTML Framework Security Feature Bypass Vulnerability

CVSS Score
8.8
EPSS Score
28.0%
EPSS Percentile
96th

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

Vendor microsoft
Product windows 10 version 1607
Ecosystems
Industries
TechnologyEnterprise
Published Feb 10, 2026
Last Updated Apr 10, 2026
⚠️ Actively Exploited — Act Now

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability

Affected Versions

Microsoft / Windows 10 Version 1607
10.0.14393.0 < 10.0.14393.8868
Microsoft / Windows 10 Version 1809
10.0.17763.0 < 10.0.17763.8389
Microsoft / Windows 10 Version 21H2
10.0.19044.0 < 10.0.19044.6937
Microsoft / Windows 10 Version 22H2
10.0.19045.0 < 10.0.19045.6937
Microsoft / Windows 11 version 22H3
10.0.22631.0 < 10.0.22631.6649
Microsoft / Windows 11 Version 23H2
10.0.22631.0 < 10.0.22631.6649
Microsoft / Windows 11 Version 24H2
10.0.26100.0 < 10.0.26100.7840
Microsoft / Windows 11 Version 25H2
10.0.26200.0 < 10.0.26200.7840
Microsoft / Windows 11 version 26H1
10.0.28000.0 < 10.0.28000.1575
Microsoft / Windows 11 Version 26H1
10.0.28000.0 < 10.0.28000.1575
Microsoft / Windows Server 2012
6.2.9200.0 < 6.2.9200.25923
Microsoft / Windows Server 2012 (Server Core installation)
6.2.9200.0 < 6.2.9200.25923
Microsoft / Windows Server 2012 R2
6.3.9600.0 < 6.3.9600.23022
Microsoft / Windows Server 2012 R2 (Server Core installation)
6.3.9600.0 < 6.3.9600.23022
Microsoft / Windows Server 2016
10.0.14393.0 < 10.0.14393.8868
Microsoft / Windows Server 2016 (Server Core installation)
10.0.14393.0 < 10.0.14393.8868
Microsoft / Windows Server 2019
10.0.17763.0 < 10.0.17763.8389
Microsoft / Windows Server 2019 (Server Core installation)
10.0.17763.0 < 10.0.17763.8389
Microsoft / Windows Server 2022
10.0.20348.0 < 10.0.20348.4773
Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.0 < 10.0.25398.2149
Microsoft / Windows Server 2025
10.0.26100.0 < 10.0.26100.32370
Microsoft / Windows Server 2025 (Server Core installation)
10.0.26100.0 < 10.0.26100.32370

References

NVD ↗ CVE.org ↗ EPSS Data ↗
msrc.microsoft.com: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513 cisa.gov: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513 vicarius.io: https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-feature-bypass-vulnerability-in-mshtml-framework vicarius.io: https://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security-feature-bypass-vulnerability-in-mshtml-framework