CVE-2026-21510

Published Feb 10, 2026

Last updated 16 days ago

Overview

Description
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
Source
secure@microsoft.com
NVD status
Analyzed
Products
windows_10_1607, windows_10_1809, windows_10_21h2, windows_10_22h2, windows_11_23h2, windows_11_24h2, windows_11_25h2, windows_server_2012, windows_server_2016, windows_server_2019, windows_server_2022, windows_server_2022_23h2, windows_server_2025

Risk scores

CVSS 3.1

Type
Secondary
Base score
8.8
Impact score
5.9
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Severity
HIGH

Known exploits

Data from CISA

Vulnerability name
Microsoft Windows Shell Protection Mechanism Failure Vulnerability
Exploit added on
Feb 10, 2026
Exploit action due
Mar 3, 2026
Required 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.

Weaknesses

secure@microsoft.com
CWE-693

Social media

Hype score
Not currently trending

Configurations