CVEvulnerability

CVE-2026-21510

8.8 HIGH Known exploited Published 2026-02-10 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Windows Shell Protection Mechanism Failure Vulnerability — Microsoft Windows

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

Added to KEV
2026-02-10
Remediation due
2026-03-03
Ransomware use
Unknown
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.
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21510
Status
Analyzed
Published
2026-02-10
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-693

Description

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

Affected configurations

• microsoft windows 10 1607 (< 10.0.14393.8868) • microsoft windows 10 1809 (< 10.0.17763.8389) • microsoft windows 10 21h2 (< 10.0.19044.6937) • microsoft windows 10 22h2 (< 10.0.19045.6937) • microsoft windows 11 23h2 (< 10.0.22631.6649) • microsoft windows 11 24h2 (< 10.0.26100.7781) • microsoft windows 11 25h2 (< 10.0.26200.7781) • microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 (< 10.0.14393.8868) • microsoft windows server 2019 (< 10.0.17763.8389) • microsoft windows server 2022 (< 10.0.20348.4711) • microsoft windows server 2022 23h2 (< 10.0.25398.2149) • microsoft windows server 2025 (< 10.0.26100.32313)

Related

Weakness · CWE (1)

  • CWE-693 Protection Mechanism Failure weakness

References