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CVE-2026-56155 is an elevation of privilege vulnerability in Active Directory Federation Services (AD FS). The flaw is caused by insufficient granularity of access control within AD FS, enabling an authorized attacker with local access to perform actions beyond their intended permissions and escalate privileges. Microsoft rates the issue as Important with a CVSS v3 score of 7.8, and exploitation in the wild has been reported. Successful exploitation can result in administrator-level privileges on the affected AD FS system.
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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.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Active Directory Federation Services elevation-of-privilege zero-day vulnerability in Microsoft's July Patch Tuesday release.
A privilege escalation vulnerability in Active Directory Federation Services (AD FS) that has been exploited as a zero-day.
An elevation of privilege vulnerability in Active Directory Federation Services that was exploited in the wild as a zero-day and could allow an attacker to gain administrator privileges.
An elevation of privilege vulnerability in Active Directory Federation Services (AD FS). It is significant because the content states it is exploited in the wild and could enable compromise of identity infrastructure in hybrid environments.
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.