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High severity · published Feb 10, 2026
CVE-2026-21510
Windows Shell Security Feature Bypass Vulnerability
In wildKEV
8.8
CVSS
61.2%
EPSS
Yes
On KEV
Description
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)61.2% · higher than 99% of CVEs
Exploited in the wildYes
CISA KEVListed Feb 10, 2026
Federal remediation dueMar 3, 2026
Ransomware campaign useNot known
Affected products
Which versions
WI
Windows · Microsoft
All versions, or not specified · source: KEV
W1
Windows 10 Version 1607 · Microsoft
10.0.14393.0 before 10.0.14393.8868 · source: vendor
W1
Windows 10 Version 1809 · Microsoft
10.0.17763.0 before 10.0.17763.8389 · source: vendor
W1
Windows 10 Version 21H2 · Microsoft
10.0.19044.0 before 10.0.19044.6937 · source: vendor
W1
Windows 10 Version 22H2 · Microsoft
10.0.19045.0 before 10.0.19045.6937 · source: vendor
W1
Windows 11 Version 23H2 · Microsoft
10.0.22631.0 before 10.0.22631.6649 · source: vendor
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.7840 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.7840 · source: vendor
W1
Windows 11 version 22H3 · Microsoft
10.0.22631.0 before 10.0.22631.6649 · source: vendor
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.1575; 10.0.28000.0 before 10.0.28000.1575 · source: vendor
WS
Windows Server 2012 · Microsoft
6.2.9200.0 before 6.2.9200.25923 · source: vendor, NVD
WS
Windows Server 2012 (Server Core installation) · Microsoft
6.2.9200.0 before 6.2.9200.25923 · source: vendor
In the news
VulnerabilityHigh
[CISA KEV] CVE-2026-21510: Microsoft Windows - 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.
WIWindowsCVE-2026-21510
Feb 10, 2026·CISA KEV
Affected product
WI
Windows
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21510
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21510
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510
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