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CVE-2026-56155 is a high-severity elevation-of-privilege vulnerability in Microsoft Active Directory Federation Services (AD FS). Insufficient granularity in AD FS access control permits an authorized local attacker with low privileges to elevate to administrator privileges on an affected AD FS server. The issue is associated with insecure permissions affecting the AD FS Distributed Key Manager (DKM), which stores symmetric keys used to protect token-signing and token-encryption certificates. The vulnerability has been reported as actively exploited.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
119 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Active Directory Federation Services vulnerability listed among vulnerabilities actively exploited or operationally weaponized in July 2026.
A Microsoft vulnerability acknowledged as already being actively exploited in the wild, though not rated Critical in this content.
A privilege escalation vulnerability in Microsoft Active Directory Federation Services (AD FS) caused by insufficient granularity of access control, allowing an authorized local attacker with low privileges to elevate privileges on the system.
A local privilege escalation vulnerability in Active Directory Federation Services (AD FS) that can be exploited by an authenticated attacker with limited privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.