CVE-2026-59225 – Open WebUI: Arena task endpoints can bypass underlying model access controls

CVE ID :CVE-2026-59225

Published : July 9, 2026, 5:17 p.m. | 31 minutes ago

Description :Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.12 before 0.10.0, an authenticated non-admin user with read access to an arena wrapper model can reach a restricted underlying model through task endpoints such as /api/v1/tasks/moa/completions. The normal chat route resolves arena models before the final chat dispatch and therefore re-checks the selected underlying model. The task routes call utils.chat.generate_chat_completion() directly. In that direct path, arena fallback resolution happens after the wrapper access check and then recurses with bypass_filter=True, skipping the selected submodel’s access check. This issue is fixed in version 0.10.0.

Severity: 5.4 | MEDIUM

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