Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 79.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.8.11	GHSA-x3qm-p8hr-3c3h
PyPI	open-webui	0.8.11	PYSEC-2026-2768

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.8.11

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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