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CVE-2026-21513

MSHTML Framework Security Feature Bypass Vulnerability

Published: Feb 10, 2026Updated: Feb 11, 2026 Sources: CVE List NVD BDUCWE-693
8.8HIGH
NVD MITRE
EPSS Score
15.4%
Top 3.6%
CISA KEV
Active Exploitation
Since Feb 10, 2026
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-693

Affected Products

Microsoft Corp
commercial·USaka microsoft, microsoft corporation
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows 11 version 22H3On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022, 23H2 Edition (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
and 48 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Feb 10, 2026
Remediation due:Mar 3, 2026

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.

Official Patch Available
Is your org exposed to CVE-2026-21513?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513
msrc.microsoft.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21513
cisa.gov
News mentions
3

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