{"id":"CVE-2026-56164","title":"Microsoft SharePoint Server Elevation of Privilege Vulnerability","summary":"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-306"],"vendor":"Microsoft","product":"Microsoft SharePoint Enterprise Server 2016","affected":["sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001","sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175","sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434"],"ssvc":{"exploitation":"active","automatable":"yes","technicalImpact":"partial","timestamp":"2026-07-14T18:45:11.388695Z"},"exploited":true,"exploitAvailable":true,"published":"2026-07-14","updated":"2026-09-17","sourceUpdated":"2026-09-17T22:29:12.623Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56164","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164","label":"Microsoft SharePoint Server Elevation of Privilege Vulnerability"}],"tags":["cve.org","in-the-wild","exploit-available","kev"],"epss":0.26636,"epssPercentile":0.97975,"kev":true,"kevDateAdded":"2026-07-14","kevDueDate":"2026-07-17","kevRansomware":false,"exploits":{"github":2,"githubRepos":["https://github.com/sentinel-aidefense/CVE-2026-56164-EXP","https://github.com/sam00/POC-CVE-2026-56164-exploit"],"checkedAt":"2026-09-21T15:29:41.191Z"},"zeroDay":true,"ingestedAt":"2026-09-08T17:06:31.928Z","slug":"CVE-2026-56164","body":"## Overview\n\nMissing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.\n\n## Affected\n\n- `sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001`\n- `sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175`\n- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":59,"depthScoreParts":{"impact":29.2,"likelihood":5.3,"exploitation":25,"ransomware":0},"changes":[]}