High 7.8
KEV-listed
CVE-2026-56155
Microsoft Patches Zero-Day Vulnerabilities in Active Directory and SharePoint
Vendor / product: Microsoft Active Directory Federation Services, Microsoft SharePoint Server
Event date: 2026-07-01
Public PoC: Yes
First tracked by RiskWire: 2026-08-19
CISA KEV catalog
Added to KEV
Federal remediation due
2026-07-28 (54 days overdue)
Ransomware campaign use
Unknown
CISA description
Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.
Required action
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.
Sources & citations (1)
- Right To Know - August 2026, Vol. 44 jdsupra.com · 2026-08-19
References
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