{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-26164","assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","state":"PUBLISHED","assignerShortName":"microsoft","dateReserved":"2026-02-11T18:33:57.776Z","datePublished":"2026-05-07T20:58:09.538Z","dateUpdated":"2026-05-15T17:13:38.118Z"},"containers":{"cna":{"title":"M365 Copilot Information Disclosure Vulnerability","datePublic":"2026-05-07T14:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:365_copilot_business_chat:*:*:*:*:*:*:*:*","versionStartIncluding":"-"}]}]}],"affected":[{"vendor":"Microsoft","product":"Microsoft 365 Copilot's Business Chat","versions":[{"version":"-","status":"affected"}]}],"descriptions":[{"value":"Improper neutralization of special elements in output used by a downstream component ('injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.","lang":"en-US"}],"problemTypes":[{"descriptions":[{"description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en-US","type":"CWE","cweId":"CWE-74"}]}],"providerMetadata":{"orgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","shortName":"microsoft","dateUpdated":"2026-05-15T17:13:38.118Z"},"references":[{"name":"M365 Copilot Information Disclosure Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"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"}}],"tags":["exclusively-hosted-service"]},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-08T13:51:52.712667Z","id":"CVE-2026-26164","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-08T13:52:02.167Z"}}]}}