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HIGH CISA KEV

CVE-2026-56155

CVSS v3

7.8

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-10-19

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-56155 yet.

Full record on NVD

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
2026-07-14
Patch Due Date
2026-07-28
Ransomware Use
Unknown

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-07-14
Last Modified
2026-07-15

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 2026-07-28.

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 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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