{"id":"CVE-2026-59225","aliases":["GHSA-m3qf-58wf-w979","PYSEC-2026-3601"],"url":"https://o3.security/vulnerability/CVE-2026-59225","summary":"Open WebUI: Arena task endpoints can bypass underlying model access controls","details":"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.","published":"2026-07-09T17:12:14.141Z","modified":"2026-08-12T03:51:46.788056962Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L"},"epss":{"score":0.00211,"percentile":0.11342,"asOf":"2026-09-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.10.0"}],"fix":{"url":"https://github.com/open-webui/open-webui/commit/dc4924b66e655b315e3be4430a3e51b7d5c20acc","label":"open-webui/open-webui@dc4924b"},"references":[{"type":"WEB","url":"https://github.com/open-webui/open-webui/releases/tag/v0.10.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59225.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-m3qf-58wf-w979"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59225"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/commit/dc4924b66e655b315e3be4430a3e51b7d5c20acc"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/pull/26046"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:46.788056962Z"}}