{"id":"CVE-2026-56164","aliases":["EUVD-2026-44043","GHSA-hc2f-r46j-4w6x"],"status":"published","title":"Microsoft SharePoint Server Elevation of Privilege Vulnerability","description":"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","severity":{"version":"3.1","score":5.3,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.2733,"percentile":0.98087,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-306"],"published":"2026-07-14T17:05:12Z","modified":"2026-11-10T22:35:43Z","kev":{"date_added":"2026-07-14","due_date":"2026-07-17","required_action":"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.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-07-14"},{"source":"kev","since":"2026-07-14"}],"exploits":[{"source":"pocgithub","id":"sam00/POC-CVE-2026-56164-exploit","title":"sam00/POC-CVE-2026-56164-exploit","date":"2026-08-06","url":"https://github.com/sam00/POC-CVE-2026-56164-exploit"}],"products":[{"vendor":"microsoft","product":"microsoft sharepoint enterprise server 2016"},{"vendor":"microsoft","product":"microsoft sharepoint server 2019"},{"vendor":"microsoft","product":"microsoft sharepoint server subscription edition"},{"vendor":"microsoft","product":"sharepoint server"},{"vendor":"microsoft","product":"sharepoint_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56164"},{"url":"https://github.com/advisories/GHSA-hc2f-r46j-4w6x"}],"sources":{"cve":[{"id":"CVE-2026-56164","title":"Microsoft SharePoint Server Elevation of Privilege Vulnerability","description":"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-14T17:05:12.313Z","modified":"2026-11-10T22:35:43.72Z","cvss":[{"version":"3.1","score":5.3,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-10T23:49:29.755102Z"}],"euvd":[{"id":"EUVD-2026-44043","description":"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-14T17:05:12Z","modified":"2026-11-10T22:35:43Z","cvss":[{"version":"3.1","score":5.3,"vector":"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","level":"medium"}],"exploited_since":"2026-07-14","updated_at":"2026-11-10T23:24:15.503335Z"}],"ghsa":[{"id":"GHSA-hc2f-r46j-4w6x","title":"Missing authentication for critical function in Microsoft Office SharePoint allows an...","description":"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-14T18:32:10Z","modified":"2026-07-14T21:32:51Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:09:31.957545Z"}],"kev":[{"id":"CVE-2026-56164","title":"Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability","description":"Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.","cwes":["CWE-306"],"kev":{"date_added":"2026-07-14","due_date":"2026-07-17","required_action":"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.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-56164","description":"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-14T17:17:09.907Z","modified":"2026-07-14T21:10:41.693Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}