CVE-2026-21513 HIGH

CVE-2026-21513: MSHTML Framework Security Feature Bypass Vulnerability

Vendor Microsoft
Product Windows 10 Version 1607
Weakness CWE-693
KEV Status Known Exploited
Published February 10, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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

CISA mandated remediation

02CISA Required Action

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

Key dates

03Disclosure timeline

February 10, 2026 CVE published
May 11, 2026 Record updated