CVE-2026-45349

HIGH

Open WebUI: Broken Access Control for Completions API

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.1
EPSS 0.0004
EPSS Percentile 11.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-639
Status published
Products (3)
open-webui/open-webui < 0.9.0
openwebui/open_webui < 0.9.0
pypi/open-webui 0 - 0.9.0PyPI
Published May 15, 2026
Tracked Since May 16, 2026