HIGH CISA KEV

CVE-2026-56155

CVSS v3

7.8

HIGH

EPSS Score

0.4%

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

Description

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

CISA Known Exploited Vulnerability

Date Added: 7/14/2026
Patch Due Date: 7/28/2026
Ransomware Use: Unknown

Technical details

CVSS v3 Vector: 3.1
Published: 7/14/2026
Last Modified: 7/15/2026
CERT-FR Advisory: CERTFR-2026-AVI-0869
CERT-FR Link: CERTFR-2026-AVI-0869

Frequently asked questions

What is CVE-2026-56155?

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

Is CVE-2026-56155 actively exploited?

Yes. CVE-2026-56155 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 7/28/2026.

What is the CVSS score for CVE-2026-56155?

CVE-2026-56155 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string 3.1.

Is CVE-2026-56155 affecting your environment?

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