CVE-2026-45666

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductOpenwebui Open Webui

PublishedMay 15, 2026

First seenMay 15, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

openwebui open_webui0.8.11 or later
open-webui0.8.11 or later

Affected products

Product	Affected versions	Fixed in
openwebui open_webui	v < 0.8.11	0.8.11
open-webuiPyPI	v < 0.8.11	0.8.11

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.