{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86867", "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b", "state": "PUBLISHED", "assignerShortName": "certcc", "dateReserved": "2026-09-08T16:29:11.518Z", "datePublished": "2026-09-23T17:44:52.482Z", "dateUpdated": "2026-09-23T18:10:51.647Z"}, "containers": {"cna": {"title": "Cinnamon's kotaemon contains improper authorization checks in multi\u2011user chat handlers", "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."}], "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Cinnamon AI", "product": "Kotaemon", "versions": [{"status": "affected", "version": "0.12.0"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-862 Missing Authorization"}]}, {"descriptions": [{"lang": "en", "description": "CWE-639 Authorization Bypass Through User-Controlled Key"}]}, {"descriptions": [{"lang": "en", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"}]}], "references": [{"url": "https://kb.cert.org/vuls/id/754548"}], "x_generator": {"engine": "VINCE 3.0.49", "env": "prod", "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-86867"}, "providerMetadata": {"orgId": "37e5125f-f79b-445b-8fad-9564f167944b", "shortName": "certcc", "dateUpdated": "2026-09-23T17:44:52.482Z"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://www.kb.cert.org/vuls/id/754548"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-23T18:10:51.647Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "Kotaemon", "vendor": "Cinnamon AI", "versions": [{"status": "affected", "version": "0.12.0"}]}], "source": "cret@cert.org"}], "cveTags": [], "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."}], "id": "CVE-2026-86867", "lastModified": "2026-09-23T19:19:42.080", "metrics": {}, "published": "2026-09-23T18:17:09.323", "references": [{"source": "cret@cert.org", "url": "https://kb.cert.org/vuls/id/754548"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/754548"}], "sourceIdentifier": "cret@cert.org", "vulnStatus": "Deferred"}

{}

{"created": "2026-09-23T20:00:09.002455+00:00", "updated": "2026-09-23T20:00:09.002462+00:00", "vendors": [], "weaknesses": ["CWE-284"]}