Vulnerability Report

CVE-2026-45666

Title: Unauthorized note disclosure

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-45666.

CWE Category CWE-639

Published Date May 15, 2026

Modified Date May 19, 2026

Exploit Status Not Found

Score 6.5 CVSS v3.1

Exploit Probability (EPSS)

0.28%

Vulnerability Summary

CVE-2026-45666: 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.

Impacted Vendors

openwebui 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-45666 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 19, 2026 MODIFIED

Vulnerability data updated via NVD.

May 18, 2026 MODIFIED

Vulnerability data updated via NVD.

May 15, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.