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Vulnerable Software

Vulnerability Details CVE-2026-21221

Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 10.7%

CVSS Severity

CVSS v3 Score 7.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21221

Products affected by CVE-2026-21221

Microsoft » Windows 11 24h2 » Version: N/A

cpe:2.3:o:microsoft:windows_11_24h2:-
Microsoft » Windows 11 24h2 » Version: 10.0.26100.1742

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.1742
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2033

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2033
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2161

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2161
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2314

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2314
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2454

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2454
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2605

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2605
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2894

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2894
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3107

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3107
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3194

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3194
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3403

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3403
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3476

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3476
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3775

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3775
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3981

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3981
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4061

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4061
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4270

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4270
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4349

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4349
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4652

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4652
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4851

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4851
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4946

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4946
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6508

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6508
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6563

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6563
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6584

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6584
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6899

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6899
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7092

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7092
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7171

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7171
Microsoft » Windows 11 25h2 » Version: N/A

cpe:2.3:o:microsoft:windows_11_25h2:-
Microsoft » Windows 11 25h2 » Version: 10.0.26200.6899

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.6899
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7092

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7092
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7171

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7171
Microsoft » Windows Server 2025 » Version: N/A

cpe:2.3:o:microsoft:windows_server_2025:-
Microsoft » Windows Server 2025 » Version: 10.0.26100.2033

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2033
Microsoft » Windows Server 2025 » Version: 10.0.26100.2314

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2314
Microsoft » Windows Server 2025 » Version: 10.0.26100.2605

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2605
Microsoft » Windows Server 2025 » Version: 10.0.26100.2894

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2894
Microsoft » Windows Server 2025 » Version: 10.0.26100.3107

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3107
Microsoft » Windows Server 2025 » Version: 10.0.26100.3194

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3194
Microsoft » Windows Server 2025 » Version: 10.0.26100.3403

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3403
Microsoft » Windows Server 2025 » Version: 10.0.26100.3476

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3476
Microsoft » Windows Server 2025 » Version: 10.0.26100.3775

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3775
Microsoft » Windows Server 2025 » Version: 10.0.26100.3781

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3781
Microsoft » Windows Server 2025 » Version: 10.0.26100.3981

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3981
Microsoft » Windows Server 2025 » Version: 10.0.26100.4061

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4061
Microsoft » Windows Server 2025 » Version: 10.0.26100.4066

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4066
Microsoft » Windows Server 2025 » Version: 10.0.26100.4270

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4270
Microsoft » Windows Server 2025 » Version: 10.0.26100.4349

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4349
Microsoft » Windows Server 2025 » Version: 10.0.26100.4652

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4652
Microsoft » Windows Server 2025 » Version: 10.0.26100.4656

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4656
Microsoft » Windows Server 2025 » Version: 10.0.26100.4851

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4851
Microsoft » Windows Server 2025 » Version: 10.0.26100.4946

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4946
Microsoft » Windows Server 2025 » Version: 10.0.26100.6508

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6508
Microsoft » Windows Server 2025 » Version: 10.0.26100.6563

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6563
Microsoft » Windows Server 2025 » Version: 10.0.26100.6584

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6584
Microsoft » Windows Server 2025 » Version: 10.0.26100.6899

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6899
Microsoft » Windows Server 2025 » Version: 10.0.26100.6905

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6905
Microsoft » Windows Server 2025 » Version: 10.0.26100.7092

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7092
Microsoft » Windows Server 2025 » Version: 10.0.26100.7171

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7171
Microsoft » Windows Server 2025 » Version: 10.0.26100.7623

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7623

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Vulnerability Details CVE-2026-21221

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