{"id":"CVE-2026-50517","aliases":["EUVD-2026-48457","GHSA-cfm3-7vpc-px47"],"status":"published","title":"Microsoft M365 Copilot Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","severity":{"version":"3.1","score":9.9,"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01694,"percentile":0.77461,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-502"],"published":"2026-07-24T00:01:11Z","modified":"2026-11-10T22:41:07Z","products":[{"vendor":"microsoft","product":"365_copilot"},{"vendor":"microsoft","product":"microsoft 365 copilot"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50517"},{"url":"https://github.com/advisories/GHSA-cfm3-7vpc-px47"}],"sources":{"cve":[{"id":"CVE-2026-50517","title":"Microsoft M365 Copilot Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-24T00:01:11.819Z","modified":"2026-11-10T22:41:07.79Z","cvss":[{"version":"3.1","score":9.9,"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","level":"critical","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-10T23:49:29.024872Z"}],"euvd":[{"id":"EUVD-2026-48457","description":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-24T00:01:11Z","modified":"2026-11-10T22:41:07Z","cvss":[{"version":"3.1","score":9.9,"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","level":"critical"}],"updated_at":"2026-11-11T00:24:46.475072Z"}],"ghsa":[{"id":"GHSA-cfm3-7vpc-px47","title":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code...","description":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-24T03:31:55Z","modified":"2026-07-24T03:31:55Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:09:45.375488Z"}],"nvd":[{"id":"CVE-2026-50517","description":"Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-24T01:17:02.257Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"3.1","score":9.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:12:32.473901Z"}]}}