CVE-2026-56155: listed in the CISA KEV catalog

CVE-2026-56155 · CVSS 7.8 HIGH · KEV 2026-07-14 · patch available

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

Is CVE-2026-56155 exploited?

• Listed in the CISA KEV catalog on 2026-07-14.
• Federal remediation due 2026-07-28.
• Past that date by 18 days.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

• KB5099538
• KB5099540
• KB5099536
• KB5099535
• KB5099445
• KB5099444

What PlainSec published about CVE-2026-56155

PlainSec has not published a story about this CVE.

Primary sources

• NVD record
• CISA KEV catalog
• Microsoft KB5099538
• Microsoft KB5099540
• Microsoft KB5099536
• Microsoft KB5099535
• Microsoft KB5099445
• Microsoft KB5099444

What this record does not say

• No EPSS score.
• No affected package data.

KEV and EPSS are re-checked daily. Record last updated 2026-08-14.