{"@odata.context":"https://api.msrc.microsoft.com/sug/v2.0/sugodata/v2.0/en-US/$metadata#vulnerability/$entity","id":"00000000-0000-0000-0000-00007199321a","releaseDate":"2026-10-13T07:00:00-07:00","cveNumber":"CVE-2026-102866","cveTitle":"Microsoft Office SharePoint Elevation of Privilege Vulnerability","releaseNumber":"2026-Oct","vulnType":"Security Vulnerability","latestRevisionDate":"2026-10-13T07:00:00-07:00","description":"<p>Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.</p>\n","cweList":["CWE-347: Improper Verification of Cryptographic Signature"],"cweDetailsListForSearch":["cwe: CWE-347: Improper Verification of Cryptographic Signature","cweUrl: https://cwe.mitre.org/data/definitions/347.html"],"unformattedDescription":"<p>Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.</p>","mitreText":"CVE-2026-102866","mitreUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102866","publiclyDisclosed":"No","exploited":"No","latestSoftwareReleaseId":2,"latestSoftwareRelease":"Exploitation Less Likely","olderSoftwareReleaseId":0,"denialOfService":"N/A","tag":"Microsoft Office SharePoint","issuingCna":"Microsoft","issuingCnaId":100000001,"severityId":100000000,"severity":"Critical","impactId":100000002,"impact":"Elevation of Privilege","langCode":"en-US","baseScore":"8.1","temporalScore":"7.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","vectorStringSource":"Microsoft","isMariner":false,"customerActionRequired":true,"customerActionRequiredId":1,"cweDetailsList":[{"keys":["cwe","cweUrl"],"values":["CWE-347: Improper Verification of Cryptographic Signature","https://cwe.mitre.org/data/definitions/347.html"]}],"articles":[{"articleType":"FAQ","description":"<p><strong>Is the Preview Pane an attack vector for this vulnerability?</strong></p>\n<p>No, the Preview Pane is not an attack vector.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>How could an attacker exploit this vulnerability?</strong></p>\n<p>An unauthenticated attacker who obtains a valid proof token for a targeted user could modify the token and submit it to an affected SharePoint server. Successful exploitation could allow the attacker to authenticate as that user and access or modify content available to the compromised account. User interaction is not required.</p>\n","ordinal":10000},{"articleType":"FAQ","description":"<p><strong>According to the CVSS metric, the attack complexity is high (AC:H). What does this mean for this vulnerability?</strong></p>\n<p>An attacker would need specific conditions to be in place (i.e. particular protocol settings, or configurations, etc.) before an attack could succeed, which reduces the likelihood of widespread or opportunistic exploitation.</p>\n","ordinal":10000},{"title":"Microsoft Office SharePoint Elevation of Privilege Vulnerability","articleType":"100000000","description":"<p>Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.</p>\n","ordinal":10000}],"revisions":[{"cveNumber":"CVE-2026-102866","version":1,"revisionDate":"2026-10-13T07:00:00-07:00","initialDate":"0001-01-01T00:00:00Z","description":"<p>Information published.</p>\n","unformattedDescription":"Information published.","notificationNeeded":false,"notificationSent":false,"sourceId":"30b6e407-56bc-f111-aaad-000d3a37724b"}]}