{"id":"CVE-2026-78501","aliases":["EUVD-2026-82590","GHSA-hjj2-64g6-jw5p"],"status":"published","title":"Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability","description":"Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0054,"percentile":0.4588,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-77","CWE-923"],"published":"2026-09-17T22:55:56Z","modified":"2026-11-10T21:33:08Z","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-2026-78501","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78501"},{"url":"https://github.com/advisories/GHSA-hjj2-64g6-jw5p"}],"sources":{"cve":[{"id":"CVE-2026-78501","title":"Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability","description":"Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-09-17T22:55:56.907Z","modified":"2026-11-10T21:33:08.601Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-77","CWE-923"],"updated_at":"2026-11-10T22:48:53.557052Z"}],"euvd":[{"id":"EUVD-2026-82590","description":"Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-09-17T22:55:56Z","modified":"2026-11-10T21:33:08Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:49.679186Z"}],"ghsa":[{"id":"GHSA-hjj2-64g6-jw5p","title":"Improper neutralization of special elements used in a command ('command injection') in Microsoft...","description":"Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-09-18T00:31:09Z","modified":"2026-09-18T00:31:15Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T15:12:08.779152Z"}],"nvd":[{"id":"CVE-2026-78501","description":"Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-09-17T23:18:45.77Z","modified":"2026-10-14T23:19:04.093Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-77","CWE-923"],"updated_at":"2026-11-02T14:12:49.70655Z"}]}}