Medium 5.3
KEV-listed
CVE-2026-56164
Exploitation of Privilege Escalation Vulnerability CVE-2026-56164 in Microsoft SharePoint Server
Vendor / product: Microsoft SharePoint Server
Event date: 2026-07-01
Public PoC: Yes
First tracked by RiskWire: 2026-10-14
CISA KEV catalog
Added to KEV
Federal remediation due
2026-07-17 (89 days overdue)
Ransomware campaign use
Unknown
CISA description
Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.
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)
- CVE-2026-56164: Exploiting A Privilege Escalation Vulnerability In Microsoft SharePoint cybersecurefox.com · 2026-10-13
References
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