{"id":"CVE-2026-102866","title":"Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","summary":"Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-347"],"vendor":"microsoft","product":"sharepoint_server","affected":["sharepoint_server < 16.0.20326.20190"],"patched":["sharepoint_server 16.0.20326.20190"],"published":"2026-10-13","updated":"2026-10-14","sourceUpdated":"2026-10-14T19:45:04.610","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102866","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102866","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00666,"epssPercentile":0.51623,"ingestedAt":"2026-10-13T19:43:28.899Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-13T21:14:01.595856Z"},"slug":"CVE-2026-102866","body":"## Overview\n\nImproper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.\n\n## Affected\n\n- `sharepoint_server < 16.0.20326.20190`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `sharepoint_server 16.0.20326.20190`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}