Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter

SummarySeveral direct, index-addressed Ollama proxy routes accept a caller-supplied urlidxpath parameter and use it as a raw index into the admin-configured OLLAMABASEURLSlist. Access control on these routes validates only whether the user may use therequested model, never which backend the reque...

CVE-2026-54021 Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied urlidx path parameter and use it as a raw index into the admin-configured OLLAMABASEURLS list. Access...

CVE-2026-54021

Summary: Open WebUI prior to 0.9.6 allows any authenticated user to direct requests to arbitrary Ollama backends by appending a caller-supplied url_idx, bypassing backend-level isolation and possibly reaching restricted or disabled backends. The issue arises on index-addressed Ollama proxy routes...