CVE-2026-21510

HIGH
2026-02-10 [email protected]
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
Added to CISA KEV
Feb 11, 2026 - 16:13 cisa
CISA KEV
PoC Detected
Feb 11, 2026 - 16:13 vuln.today
Public exploit code
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 8.8

Tags

Windows Windows 11 23h2 Windows Server 2016 Windows 10 21h2 Windows Server 2025 Windows 10 22h2 Windows Server 2022 23h2 Windows 10 1809 Windows 10 1607 Windows Server 2019 Windows 11 24h2 Windows 11 25h2 Windows Server 2012 Windows Server 2022 Microsoft

Description

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

Analysis

Windows Shell contains a protection mechanism failure (CVE-2026-21510, CVSS 8.8) that allows unauthenticated remote attackers to bypass security features over a network. KEV-listed, this vulnerability in the core Windows Shell component enables remote code execution by circumventing security boundaries designed to prevent execution of untrusted content received from the network.

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Remediation

Within 24 hours: Inventory all Windows systems and identify those running vulnerable Shell versions; disable Windows Shell features where operationally feasible and implement network segmentation to restrict Shell access. Within 7 days: Deploy enhanced monitoring and EDR solutions to detect exploitation attempts; establish daily patch status reviews; brief security and IT leadership on mitigation status. …

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Priority Score

98
Low Medium High Critical
KEV: +50
EPSS: +3.8
CVSS: +44
POC: +20

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CVE-2026-21510 vulnerability details – vuln.today
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