CVE-2026-70491

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.

• CWE-200

• https://github.com/open-webui/open-webui/commit/c05de13b4fca1ac8a17153782b46b3d0aacf491cPatch
• https://github.com/open-webui/open-webui/pull/27005Patch, Vendor Advisory
• https://github.com/open-webui/open-webui/releases/tag/v0.11.0Release Notes
• https://github.com/open-webui/open-webui/security/advisories/GHSA-3r7g-q6cg-q2vxExploit, Patch, Vendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-3r7g-q6cg-q2vxExploit, Patch, Vendor Advisory

Published

Aug 4, 2026

Last Modified

Sep 18, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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