{"id":"CVE-2026-50517","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-50517","summary":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","details":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","published":"2026-07-24T01:17:02.257","modified":"2026-07-29T14:19:20.030","cvss":{"score":9.9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"epss":{"score":0.01254,"percentile":0.67513,"asOf":"2026-09-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-07-29T14:19:20.030"}}