CVE-2026-21513
MSHTML Framework Security Feature Bypass Vulnerability
In short
A flaw in MSHTML Framework allows attackers to bypass a built-in security protection through a network connection. This means malicious actors could circumvent safeguards designed to protect your system.
Technical detail
A security feature bypass vulnerability in MSHTML Framework (CWE-693: Protection Mechanism Failure) permits remote attackers to circumvent protection mechanisms without authentication. The attack vector is network-based, with no user interaction required, resulting in potential compromise of the intended security controls.
Summary generated and translated by AI from the official description.
Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.
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
Affected products
Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 22H3Microsoft · Windows 11 Version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2012Microsoft · Windows Server 2012 R2Microsoft · Windows Server 2012 R2 (Server Core installation)Microsoft · Windows Server 2012 (Server Core installation)Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)Want to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513https://www.vicarius.io/vsociety/posts/cve-2026-21513-detection-script-security-feature-bypass-vulnerability-in-mshtml-frameworkhttps://www.vicarius.io/vsociety/posts/cve-2026-21513-mitigation-script-security-feature-bypass-vulnerability-in-mshtml-framework