CVE-2026-21510

Windows Shell Security Feature Bypass Vulnerability

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

Affected

Microsoft · Windows 10 Version 1607 · Windows 10 Version 1809 · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 version 22H3 · Windows 11 Version 23H2

CVSS v3.1 MICROSOFT

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

24.54% chance of exploitation in the next 30 days, 98th percentile

CISA KEV

added 2026-02-10

Published

2026-02-10

Updated

2026-08-19

Proof-of-concept exploits (3)

• andreassudo/CVE-2026-21510-CVSS-8.8-Important-Windows-Shell-security-feature-bypass7★ · 2026-02-11
• ChaitanyaHaritash/CVE-2026-21514_CVE-2026-215107★ · 2026-05-04
• EpSiLoNPoInTOrI/EpSiLoNPoInTlnk2★ · 2026-05-09

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510

References

• CVE Record
• NVD entry

Related

• CVE-2026-21514
• CVE-2026-33824