CVE-2026-21513

UNKNOWNKnown Exploited

CISA Known Exploited Vulnerability

https://msrc.microsoft.com/update-guide/advisory/CVE-2026-21513 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21513

Remediation deadline: March 3, 2026

Description

Microsoft MSHTML Framework contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.

Timeline

Published:February 10th, 2026 12:00 AM

Last modified:February 10th, 2026 12:00 AM

Added to KEV:February 10th, 2026

CVSS Scoring

No CVSS v3 score available

Affected Software

From NVD CPE configuration data

Vendors

Microsoft

Products

Windows

Weaknesses (CWE)

CWE-693

References & Reports

Advisories, patches, and third-party reports

No references available.

Source: CISA KEV + NVD · Data may lag official sources by up to one minute