{"id":"CVE-2026-70491","aliases":["GHSA-3r7g-q6cg-q2vx","PYSEC-2026-3639"],"url":"https://o3.security/vulnerability/CVE-2026-70491","summary":"Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints","details":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin read-only users. ToolResponse deliberately omitted source and specs, but ToolUserResponse permitted extra fields and handlers spread a full tool model dump into the response, re-admitting omitted fields. A non-admin with a read grant can obtain another user's server-side tool source, which commonly embeds hard-coded API keys, credentials, and internal service URLs. This issue is fixed in 0.11.0.","published":"2026-08-04T20:51:27.840Z","modified":"2026-09-10T03:30:27.012519174Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.0026,"percentile":0.17589,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.11.0"}],"fix":{"url":"https://github.com/open-webui/open-webui/commit/c05de13b4fca1ac8a17153782b46b3d0aacf491c","label":"open-webui/open-webui@c05de13"},"references":[{"type":"WEB","url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70491.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3r7g-q6cg-q2vx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70491"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/commit/c05de13b4fca1ac8a17153782b46b3d0aacf491c"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/pull/27005"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:30:27.012519174Z"}}