CVE-2026-45365: Openwebui Open Webui

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, an internal-only bypass_filter parameter is exposed on the /openai/chat/completions and /ollama/api/chat HTTP endpoints via FastAPI query string binding, allowing any authenticated user to append ?bypass_filter=true and bypass model access control checks to invoke admin-restricted models. This vulnerability is fixed in 0.8.11.

Affected products

• Openwebui Open Webui: before 0.8.11 (fixed in 0.8.11)

Published 2026-05-15. Last modified 2026-06-17.