CVE-2026-45349CWE-639

Open WebUI: Broken Access Control for Completions API

High · published May 15, 2026

CVSS v3.1
7.1
EPSS
0%
Percentile
24.4
In the wild
Unconfirmed
What it is

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, a user just needs to use the API endpoint: /api/chat/completions with their own API key (generated in OWUI) and the Chat ID of another user to continue the conversation of the other user. This vulnerability is fixed in 0.9.0.

The record
Technical detail
CVSS v3.1
7.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00326 · 24.4th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-05-15T19:20Z
EPSS history
Timeline
  • 15 MAY 19:20Z
    Open WebUI: Broken Access Control for Completions API
    cvelistv5