Auth bypass in Open-Webui
CVE-2026-59225
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (28.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Open-Webui — versions >= 0.8.12, < 0.10.0
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/commit/dc4924b66e655b315e3be4430a3e51b7d5c20acc (Patch)
- github.com/open-webui/open-webui/pull/26046 (Patch, Issue Tracking)
- github.com/open-webui/open-webui/releases/tag/v0.10.0 (Product, Release Notes)
- github.com/open-webui/open-webui/security/advisories/GHSA-m3qf-58wf-w979 (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-59225?
- CVE-2026-59225 is a medium-severity vulnerability in Open-Webui, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-07-09.
- How severe is CVE-2026-59225?
- Medium severity. CVSS v3 base score is 5.4 out of 10.