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CVE-2026-86867— Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers

Quick assessment

Affected
Cinnamon AI Kotaemon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 that load a Conversation record by its ID

AI Predicted 6.5 Difficulty: Moderate EPSS 0.14% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cinnamon AI Kotaemon 0.12.0 affected
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I. Basic Information for CVE-2026-86867

Vulnerability Information

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Vulnerability Title
Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers
Source: CVE Program / CVE List V5
Vulnerability 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: 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cinnamon AI Kotaemon 0.12.0 -

II. Public POCs for CVE-2026-86867

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III. Intelligence Information for CVE-2026-86867

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Vendor Advisories for CVE-2026-86867 (1)

IV. Related Vulnerabilities

Same product: Kotaemon

V. Comments for CVE-2026-86867

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