{"id":"CVE-2026-54130","title":"M365 Copilot Information Disclosure Vulnerability","summary":"Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-306"],"vendor":"Microsoft","product":"Microsoft 365 Copilot","affected":["365_copilot -"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-23T00:00:00+00:00"},"published":"2026-06-18","updated":"2026-09-24","sourceUpdated":"2026-09-24T13:43:32.796Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54130","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130","label":"M365 Copilot Information Disclosure Vulnerability"}],"tags":["cve.org"],"epss":0.01084,"epssPercentile":0.6381,"ingestedAt":"2026-09-24T14:44:21.436Z","slug":"CVE-2026-54130","body":"## Overview\n\nMissing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.\n\n## Affected\n\n- `365_copilot -`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}