CVE-2026-45666 MEDIUM

CVE-2026-45666: Open WebUI: Indirect Object Reference (IDOR) in user notes

Vendor Open-Webui
Product open-webui
Weakness CWE-639 · IDOR
Published May 15, 2026
Last update May 18, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, the API /api/v1/notes/{note_id} endpoint lacks proper authorization checks, allowing authenticated users to retrieve notes belonging to other users by guessing or enumerating UUIDs. This results in unauthorized disclosure of potentially sensitive or private user data. This vulnerability is fixed in 0.8.11.

Key dates

02Disclosure timeline

May 15, 2026 CVE published
May 18, 2026 Record updated