CVE-2026-56155High· 7.8▾ Abyssal⚠ Exploited in the wild0dayPoC availableInsufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 42.9 · likelihood 0.1 · exploitation 25
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Federal remediation due Jul 28, 2026
0.3%
Last analysed / modified upstream
Added to the CISA catalog on Jul 14, 2026. Federal remediation due Jul 28, 2026. View catalog ↗
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9339windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9020windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26226windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26226windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23291windows_server_2012_r2_server_core_installation >= 6.3.9600.0 < 6.3.9600.23291windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9339windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9339windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9020windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9020windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5386windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33158windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33158Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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