{"schemaVersion":3,"id":"CVE-2026-85887","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.","dates":{"published":"2026-09-17T23:04:48.423Z","modified":"2026-10-14T23:15:02.707Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.7,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.7,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.7,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0084,"percentile":0.57193,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.36399999999999993,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00476},"history":[{"date":"2026-09-18T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0084,"percentile":0.57193}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00476,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00859,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0084,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0084,"percentile":0.57193}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-732","name":"Incorrect Permission Assignment for Critical Resource","description":"The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/732.html"}],"affected":[{"vendor":"microsoft","product":"365_copilot","name":"365 copilot","label":"365_copilot","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/microsoft/365_copilot"},{"vendor":"microsoft","product":"microsoft 365 copilot","name":"Microsoft 365 Copilot","label":"microsoft 365 copilot","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"-","noFixRecorded":false,"fixedIn":null}],"versionsText":"-","eol":null,"hubHref":"/vendor/microsoft/microsoft_365_copilot"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-17T23:04:48.423Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-14T23:15:02.707Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":31,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T13:37:25.346Z","stale":false,"partial":false}}