CVE-2026-45666

Open WebUI: Indirect Object Reference (IDOR) in user notes

State: Published
Severity: 6.5 Medium
Published: May 15, 2026
Updated: May 18, 2026
Reserved: May 12, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
open-webuiopen-webui	< 0.8.11Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-x3qm-p8hr-3c3h

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