CVE-2026-21510

Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
microsoftCNA
8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Base Score
CVSS 3.x
EPSS Score
Percentile: 90%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_10_1607
𝑥
< 10.0.14393.8868
microsoftwindows_10_1607
𝑥
< 10.0.14393.8868
microsoftwindows_10_1809
𝑥
< 10.0.17763.8389
microsoftwindows_10_1809
𝑥
< 10.0.17763.8389
microsoftwindows_10_21h2
𝑥
< 10.0.19044.6937
microsoftwindows_10_21h2
𝑥
< 10.0.19044.6937
microsoftwindows_10_21h2
𝑥
< 10.0.19044.6937
microsoftwindows_10_22h2
𝑥
< 10.0.19045.6937
microsoftwindows_10_22h2
𝑥
< 10.0.19045.6937
microsoftwindows_10_22h2
𝑥
< 10.0.19045.6937
microsoftwindows_11_23h2
𝑥
< 10.0.22631.6649
microsoftwindows_11_23h2
𝑥
< 10.0.22631.6649
microsoftwindows_11_24h2
𝑥
< 10.0.26100.7781
microsoftwindows_11_24h2
𝑥
< 10.0.26100.7781
microsoftwindows_11_25h2
𝑥
< 10.0.26200.7781
microsoftwindows_11_25h2
𝑥
< 10.0.26200.7781
microsoftwindows_server_2012
-
microsoftwindows_server_2016
𝑥
< 10.0.14393.8868
microsoftwindows_server_2019
𝑥
< 10.0.17763.8389
microsoftwindows_server_2022
𝑥
< 10.0.20348.4711
microsoftwindows_server_2022_23h2
𝑥
< 10.0.25398.2149
microsoftwindows_server_2025
𝑥
< 10.0.26100.32313
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 10
1607 (x64, x86)
1809 (x64, x86)
21H2 (arm64, x64, x86)
22H2 (arm64, x64, x86)
Windows 11
23H2 (arm64, x64)
24H2 (arm64, x64)
25H2 (arm64, x64)
26H1 (arm64, x64)
Windows Server 2012
Server Core
Standard
Windows Server 2012 R2
Server Core
Standard
Windows Server 2016
Server Core
Standard
Windows Server 2019
Server Core
Standard
Windows Server 2022
23H2 Server Core
Server Core
Standard
Windows Server 2025
Server Core
Standard
Vulnerability Media Exposure