{"id":"CVE-2026-26129","aliases":["EUVD-2026-28445","GHSA-hpvr-rjcg-4q53"],"status":"published","title":"M365 Copilot Information Disclosure Vulnerability","description":"Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01135,"percentile":0.66783,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-138"],"published":"2026-05-07T20:58:24Z","modified":"2026-10-26T20:10:00Z","products":[{"vendor":"microsoft","product":"365_copilot_chat"},{"vendor":"microsoft","product":"microsoft 365 copilot's business chat"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26129"},{"url":"https://github.com/advisories/GHSA-hpvr-rjcg-4q53"}],"sources":{"cve":[{"id":"CVE-2026-26129","title":"M365 Copilot Information Disclosure Vulnerability","description":"Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-05-07T20:58:24.05Z","modified":"2026-08-10T15:13:50.47Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-138"],"updated_at":"2026-11-02T13:38:20.971157Z"}],"euvd":[{"id":"EUVD-2026-28445","description":"Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-05-07T20:58:24Z","modified":"2026-08-10T15:13:50Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:02:01.941928Z"}],"ghsa":[{"id":"GHSA-hpvr-rjcg-4q53","title":"Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to...","description":"Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-05-08T00:31:33Z","modified":"2026-05-08T00:31:37Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-138"],"updated_at":"2026-11-02T15:07:57.010667Z"}],"nvd":[{"id":"CVE-2026-26129","description":"Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-05-07T22:16:33.607Z","modified":"2026-10-26T20:10:00.16Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-138"],"updated_at":"2026-11-02T14:12:17.842772Z"}]}}