CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.

Remediation Deadline: Mar 3, 2026

CVE-2026-21510

High

EPSS 3.8%CISA KEV

Description

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

EPSS — Exploit Probability

3.8%

Higher than 87.9% of all CVEs

Required Action

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21510

Related Articles (1)

Data Breaches

Patch Tuesday, February 2026 Edition

Microsoft today released updates to fix more than 50 security holes in its Windows operating systems and other software, including patches for a whopping six "zero-day" vulnerabilities that attackers are already exploiting in the wild.

Feb 10, 2026

Risk Assessment

ELEVATED

In CISA KEV

Details

Severity: High
EPSS: 3.8%
CISA KEV: Yes
Ransomware: Unknown
Articles: 1

Timeline

Published

Feb 10, 2026

Added to KEV

Feb 10, 2026

Remediation Due

Mar 3, 2026

Affected Product

Microsoft

Windows

View all Microsoft CVEs

External Links

NVD (NIST)CVE Details MITRE CVE