{"id":"CVE-2026-64921","published":"2026-08-11T17:06:46Z","modified":"2026-10-30T17:22:33Z","title":"Microsoft SharePoint Server Elevation of Privilege Vulnerability","vendor":"Microsoft","product":"Microsoft SharePoint Enterprise Server 2016","tier":"tail","description":{"text":"Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.","provenance":"source","from":"CVE.org"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.0094,"percentile":0.60899,"provenance":"source"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64921","tags":["vendor-advisory","patch"]}],"priority":{"score":18.3,"factors":[{"name":"EPSS percentile","points":12.18},{"name":"CVSS severity","points":6.16}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":"Microsoft SharePoint Enterprise Server 2016","versions":[">= 16.0.0, < 16.0.5565.1001"]},{"vendor":"Microsoft","product":"Microsoft SharePoint Server 2019","versions":[">= 16.0.0, < 16.0.10417.20198"]},{"vendor":"Microsoft","product":"Microsoft SharePoint Server Subscription Edition","versions":[">= 16.0.0, < 16.0.19725.20522"]}],"euvd":{"id":"EUVD-2026-56722","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-sharepoint-cwe-306"}}