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CVE-2026-56155

Severity
HIGH
CVSS
7.8
EPSS
0.02333
Risk score
57.02
CISA KEV
Yes
PoC
No
Published
2026-07-14
Modified
2026-08-06
First seen
2026-08-07
Aliases
EUVD-2026-44042, GHSA-P436-QCH3-9M59
Products
Microsoft:Active Directory Federation Services, Microsoft:Windows 10 Version 1607 10.0.14393.0 <10.0.14393.9339, Microsoft:Windows 10 Version 1809 10.0.17763.0 <10.0.17763.9020, Microsoft:Windows Server 2012 (Server Core installation) 6.2.9200.0 <6.2.9200.26226, Microsoft:Windows Server 2012 6.2.9200.0 <6.2.9200.26226, Microsoft:Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 <6.3.9600.23291, Microsoft:Windows Server 2012 R2 6.3.9600.0 <6.3.9600.23291, Microsoft:Windows Server 2016 (Server Core installation) 10.0.14393.0 <10.0.14393.9339, Microsoft:Windows Server 2016 10.0.14393.0 <10.0.14393.9339, Microsoft:Windows Server 2019 (Server Core installation) 10.0.17763.0 <10.0.17763.9020, Microsoft:Windows Server 2019 10.0.17763.0 <10.0.17763.9020, Microsoft:Windows Server 2022 10.0.20348.0 <10.0.20348.5386, Microsoft:Windows Server 2025 (Server Core installation) 10.0.26100.0 <10.0.26100.33158, Microsoft:Windows Server 2025 10.0.26100.0 <10.0.26100.33158
Sources
cisa.gov CVE-2026-56155
euvd EUVD-2026-44042

Description

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

References