GHSA-XJ3R-7J9Q-CQF2
Vulnerability from github – Published: 2026-09-23 18:31 – Updated: 2026-09-24 15:31Cinnamon'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:
1. Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.
2. Permanently delete another user's conversation.
3. Rename another user's conversation.
4. Overwrite another user's conversation's chat suggestion list.
{
"affected": [],
"aliases": [
"CVE-2026-86867"
],
"database_specific": {
"cwe_ids": [
"CWE-200"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-23T18:17:09Z",
"severity": "MODERATE"
},
"details": "Cinnamon\u0027s 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\u0027s `user_id` to the conversation\u0027s owner `Conversation.user`. This allows any authenticated user to perform the following actions:\n1. Read other user\u0027s chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\n2. Permanently delete another user\u0027s conversation.\n3. Rename another user\u0027s conversation.\n4. Overwrite another user\u0027s conversation\u0027s chat suggestion list.",
"id": "GHSA-xj3r-7j9q-cqf2",
"modified": "2026-09-24T15:31:22Z",
"published": "2026-09-23T18:31:58Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86867"
},
{
"type": "WEB",
"url": "https://kb.cert.org/vuls/id/754548"
},
{
"type": "WEB",
"url": "https://www.kb.cert.org/vuls/id/754548"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
}
]
}
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