CVE-2026-56164Medium· 5.3▾ Midnight⚠ Exploited in the wild0dayPoC availableMissing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 29.2 · likelihood 5.3 · exploitation 25
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Federal remediation due Jul 17, 2026
27%
Last analysed / modified upstream
2 GitHub repos (last check)
Added to the CISA catalog on Jul 14, 2026. Federal remediation due Jul 17, 2026. View catalog ↗
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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