CVE-2026-21510: Microsoft Windows Shell Protection Mechanism Failure Vulnerability
Microsoft Windows Shell contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.
Other sources
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
— Microsoft
Windows Shell Security Feature Bypass Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23022Patch KB5075970 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.1575Patch KB5077179 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.8868Patch KB5075999 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.25923Patch KB5075971 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.32370Fixed in 10.0.26100.32313Patch KB5075942 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.6649Patch KB5075941 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.25398.2149Patch KB5075897 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.7840Fixed in 10.0.26200.7781Patch KB5077212 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19045.6937Patch KB5075912 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.7840Fixed in 10.0.26100.7781Patch KB5077212 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.6937Patch KB5075912 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.8389Patch KB5075904 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.4773Fixed in 10.0.20348.4711Patch KB5075943
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21510?
CVE-2026-21510 has a medium severity rating due to the potential for an unauthorized attacker to bypass security features.
How do I fix CVE-2026-21510?
To mitigate CVE-2026-21510, apply the latest patches provided by Microsoft for affected Windows versions.
Which versions of Windows are affected by CVE-2026-21510?
CVE-2026-21510 affects multiple versions of Microsoft Windows, including Windows Server 2012, Windows 10, and Windows 11.
Can CVE-2026-21510 be exploited remotely?
Yes, CVE-2026-21510 can be exploited remotely, potentially allowing attackers to bypass security features over a network.
What should I do if I can't patch for CVE-2026-21510 immediately?
If immediate patching for CVE-2026-21510 is not possible, consider implementing network segmentation and strict access controls to limit exposure.