Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers
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: 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.
CVE-2026-86867
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-86867
Kotaemon
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Cinnamon AI",
"product": "Kotaemon",
"versions": [
{
"status": "affected",
"version": "0.12.0"
}
]
}
]- Related CVEs
- CVE-2026-86867
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #1603 · Revision 1
- Added to Heist Feed
- Publisher date