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CVE-2026-56155: Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability

Microsoft Active Directory Federation Services · in CISA KEV since 2026-07-14

2026-07-14added to KEV

2026-07-28federal remediation due date

0.35%EPSS exploit probability (30 days) 28.3th percentile

7.8 HIGHCVSS 3.1

Unknownknown ransomware use

0days from NVD publication to KEV

What it is

Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CWE	CWE-1220
CVSS vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
NVD published	2026-07-14 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-56155.json · all KEV CVEs

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