Description
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
CISA Known Exploited Vulnerability
Date added 2026-07-14 | Due date 2026-07-17
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.
Problem types
CWE-306: Missing Authentication for Critical Function
Product status
References
www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-56164
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 (Microsoft SharePoint Server Elevation of Privilege Vulnerability)