Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Fix
Public exploits 2
- sam00/POC-CVE-2026-56164-exploit PoC on GitHub
- sentinel-aidefense/CVE-2026-56164-EXP PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
CISA KEV required action · due 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.
Added to the catalog 2026-07-14. CISA KEV
Patch, vendor advisory and mitigation references on NVD 1
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 vendor-advisory, patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.3 · microsoftNVD modified 2026-10-28 20:01
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 1
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 vendor-advisory, patch