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CVE-2026-21510

CISA KEV

Published February 10, 2026 · Updated April 3, 2026

high

What This Means

# CVE-2026-21510 — Windows Shell Protection Bypass **What it is:** Windows Shell contains a flaw that allows attackers to bypass a security feature remotely without authentication. The vulnerability exists in a protection mechanism within the Shell component. **Impact:** An attacker on the network can circumvent Windows security controls, potentially leading to unauthorized code execution or privilege escalation depending on which protection mechanism is affected. **Action:** Apply Microsoft's patch when released. Until then, restrict network access to affected systems and monitor Windows Shell processes for suspicious behavior using EDR tools. Verify your systems are running the latest Windows updates via Windows Update or WSUS.

Official Description+

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

Affected Products

VendorProduct
MicrosoftWindows

Patch Status

Patch by 2026-03-03

Recommended Actions

  1. Check if your systems use any of the affected products listed above.
  2. Apply vendor patches immediately if available.
  3. This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
  4. Monitor vendor advisories for updates and additional mitigations.
  5. Review logs for indicators of compromise related to CVE-2026-21510.

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