CVE-2026-45349
Open WebUI: Broken Access Control for Completions API
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | open-webui |
| Product | open-webui |
| Published | May 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for open-webui open-webui
Be the first to know when new high vulnerabilities affecting open-webui open-webui are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
open-webui / open-webui
< 0.9.0