CVE-2026-21510: Microsoft Windows Shell Protection Mechanism Failure Vulnerability

CVE ID

CVE-2026-21510

Vulnerability Name

Microsoft Windows Shell Protection Mechanism Failure Vulnerability

• Project: Microsoft
• Product: Windows

Date

• Date Added: 2026-02-10
• Due Date: 2026-03-03

Description

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

Known To Be Used in Ransomware Campaigns?

Unknown

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.

Additional Notes

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

Related Security News

• Microsoft Patches 59 Vulnerabilities Including Six Actively Exploited Zero-Days

More CVEs Info

Common Vulnerabilities & Exposures (CVE) List