{"id":"CVE-2026-66808","aliases":["EUVD-2026-56750","GHSA-3hq7-6h7j-3wxc"],"status":"published","title":"Microsoft SharePoint Server Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","severity":{"version":"3.1","score":8.8,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02044,"percentile":0.81342,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-502"],"published":"2026-08-11T17:07:03Z","modified":"2026-11-10T22:00:52Z","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"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66808","tags":["vendor-advisory","patch","Vendor Advisory","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66808"},{"url":"https://github.com/advisories/GHSA-3hq7-6h7j-3wxc"}],"sources":{"cve":[{"id":"CVE-2026-66808","title":"Microsoft SharePoint Server Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","status":"published","published":"2026-08-11T17:07:03.232Z","modified":"2026-11-10T22:00:52.026Z","cvss":[{"version":"3.1","score":8.8,"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","level":"high","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-10T23:49:30.334266Z"}],"euvd":[{"id":"EUVD-2026-56750","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","status":"published","published":"2026-08-11T17:07:03Z","modified":"2026-11-10T22:00:52Z","cvss":[{"version":"3.1","score":8.8,"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","level":"high"}],"updated_at":"2026-11-10T23:24:16.815365Z"}],"ghsa":[{"id":"GHSA-3hq7-6h7j-3wxc","title":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to...","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","status":"published","published":"2026-08-11T18:31:42Z","modified":"2026-08-11T18:31:49Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:10:20.59674Z"}],"nvd":[{"id":"CVE-2026-66808","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.","status":"published","published":"2026-08-11T17:19:02.233Z","modified":"2026-08-13T13:41:49.857Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:12:36.880938Z"}]}}