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CVE-2026-21510Windows Shell Security Feature Bypass Vulnerability

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

8.8 HIGHEPSS 61.23%⚡ Known Exploited (CISA KEV)NVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
8.8HIGH3.1microsoft (CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8HIGH3.1microsoft (CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CISA required action

⚡ Known exploited · remediation due Mar 3, 2026

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Details

CVE ID
CVE-2026-21510
Status
Analyzed
Assigner (CNA)
microsoft
Published
Feb 10, 2026
Last modified
2026-08-19 16:26 UTC
Weaknesses
  • CWE-693 · Protection Mechanism Failure

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 10:16 UTC.