{"api_version":"1","generated_at":"2026-10-01T07:41:55+00:00","cve":"CVE-2026-86867","urls":{"html":"https://cve.report/CVE-2026-86867","api":"https://cve.report/api/cve/CVE-2026-86867.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-86867","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-86867"},"summary":{"title":"Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers","description":"Cinnamon's Kotaemon (all versions up to and including v0.12.0) multi-user chat interface contains multiple vulnerabilities due to incorrect authorization and improper access controls. There are four handler methods in `libs/ktem/ktem/pages/chat/control.py` that load a Conversation record by its ID without comparing the requester's `user_id` to the conversation's owner `Conversation.user`. This allows any authenticated user to perform the following actions:\r\n1. Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\r\n2. Permanently delete another user's conversation.\r\n3. Rename another user's conversation.\r\n4. Overwrite another user's conversation's chat suggestion list.","state":"PUBLISHED","assigner":"certcc","published_at":"2026-09-23 18:17:09","updated_at":"2026-09-24 15:17:49"},"problem_types":["CWE-200","CWE-639","CWE-862","CWE-862 Missing Authorization","CWE-639 Authorization Bypass Through User-Controlled Key","CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","CWE-862 CWE-862 Missing Authorization","CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key","CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"}}],"references":[{"url":"https://www.kb.cert.org/vuls/id/754548","name":"https://www.kb.cert.org/vuls/id/754548","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://kb.cert.org/vuls/id/754548","name":"https://kb.cert.org/vuls/id/754548","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86867","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86867","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cinnamon AI","product":"Kotaemon","version":"affected 0.12.0","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"86867","cve":"CVE-2026-86867","epss":"0.001370000","percentile":"0.025260000","score_date":"2026-09-24","updated_at":"2026-09-25 00:02:54"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2026-09-23T18:10:51.647Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"url":"https://www.kb.cert.org/vuls/id/754548"}],"title":"CVE Program Container"},{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-86867","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-24T14:37:13.797147Z","version":"2.0.3"},"type":"ssvc"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","description":"CWE-862 Missing Authorization","lang":"en","type":"CWE"},{"cweId":"CWE-639","description":"CWE-639 Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"},{"cweId":"CWE-200","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-24T14:37:20.022Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"Kotaemon","vendor":"Cinnamon AI","versions":[{"status":"affected","version":"0.12.0"}]}],"descriptions":[{"lang":"en","value":"Cinnamon's Kotaemon (all versions up to and including v0.12.0) multi-user chat interface contains multiple vulnerabilities due to incorrect authorization and improper access controls. There are four handler methods in `libs/ktem/ktem/pages/chat/control.py` that load a Conversation record by its ID without comparing the requester's `user_id` to the conversation's owner `Conversation.user`. This allows any authenticated user to perform the following actions:\r\n1. Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\r\n2. Permanently delete another user's conversation.\r\n3. Rename another user's conversation.\r\n4. Overwrite another user's conversation's chat suggestion list."}],"problemTypes":[{"descriptions":[{"description":"CWE-862 Missing Authorization","lang":"en"}]},{"descriptions":[{"description":"CWE-639 Authorization Bypass Through User-Controlled Key","lang":"en"}]},{"descriptions":[{"description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-09-23T17:44:52.482Z","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","shortName":"certcc"},"references":[{"url":"https://kb.cert.org/vuls/id/754548"}],"source":{"discovery":"UNKNOWN"},"title":"Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers","x_generator":{"engine":"VINCE 3.0.49","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-86867"}}},"cveMetadata":{"assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","assignerShortName":"certcc","cveId":"CVE-2026-86867","datePublished":"2026-09-23T17:44:52.482Z","dateReserved":"2026-09-08T16:29:11.518Z","dateUpdated":"2026-09-24T14:37:20.022Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-23 18:17:09","lastModifiedDate":"2026-09-24 15:17:49","problem_types":["CWE-200","CWE-639","CWE-862","CWE-862 Missing Authorization","CWE-639 Authorization Bypass Through User-Controlled Key","CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","CWE-862 CWE-862 Missing Authorization","CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key","CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-24T14:37:13.797147Z","id":"CVE-2026-86867","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"86867","Ordinal":"1","Title":"Cinnamon's kotaemon contains improper authorization checks in mu","CVE":"CVE-2026-86867","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"86867","Ordinal":"1","NoteData":"Cinnamon's Kotaemon (all versions up to and including v0.12.0) multi-user chat interface contains multiple vulnerabilities due to incorrect authorization and improper access controls. There are four handler methods in `libs/ktem/ktem/pages/chat/control.py` that load a Conversation record by its ID without comparing the requester's `user_id` to the conversation's owner `Conversation.user`. This allows any authenticated user to perform the following actions:\r\n1. Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\r\n2. Permanently delete another user's conversation.\r\n3. Rename another user's conversation.\r\n4. Overwrite another user's conversation's chat suggestion list.","Type":"Description","Title":"Cinnamon's kotaemon contains improper authorization checks in mu"}]}}}