CVE-2026-21513

HIGH
2026-02-10 [email protected]
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Added to CISA KEV
Mar 30, 2026 - 13:28 cisa
CISA KEV
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 8.8

Tags

Authentication Bypass

Description

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

Analysis

MSHTML Framework contains a protection mechanism failure (CVE-2026-21513, CVSS 8.8) allowing remote attackers to bypass security features over a network. KEV-listed, this vulnerability in the legacy HTML rendering engine (still used by many Windows applications and email clients) enables execution of malicious content by circumventing the browser's security sandbox and content restrictions.

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Remediation

Within 24 hours: Identify and inventory all systems running MSHTML Framework; activate threat monitoring for exploitation attempts and isolate any confirmed compromised systems. Within 7 days: Implement all available compensating controls listed below; conduct vulnerability scanning to identify affected assets; brief leadership on risk posture and remediation timeline. …

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Priority Score

99
Low Medium High Critical
KEV: +50
EPSS: +4.8
CVSS: +44
POC: 0

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CVE-2026-21513 vulnerability details – vuln.today
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