{"affected":[{"product":"Microsoft 365 Copilot","source":"CNA: microsoft","vendor":"Microsoft","versions":[{"status":"affected","version":"-"}]}],"cveId":"CVE-2026-50517","cwes":["CWE-502"],"description":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","epss":{"date":"2026-11-10","percentile":0.77321,"score":0.01694},"exploits":[],"kev":null,"metrics":[{"score":9.9,"severity":"critical","source":"CNA: microsoft","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","version":"3.1"}],"modifiedAt":1794350467790,"publishedAt":1784851271819,"references":[{"source":"CNA: microsoft","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517"}],"remediation":[{"kind":"fix","source":"CNA: microsoft","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517"}],"revision":"3cfe923d4b428394f7e5d133b0fb6400819861dcbd4b0ba798299b8be71ea482","sources":[{"modifiedAt":1794350467790,"name":"CNA: microsoft","retrievedAt":1794352907559,"url":"https://www.cve.org/CVERecord?id=CVE-2026-50517"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794352924136,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-50517"}],"ssvc":{"assessedAt":1784851200000,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Microsoft M365 Copilot Remote Code Execution Vulnerability","updatedAt":1794352924136}