CVE-2026-87015

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 until 0.11.1, backend/open_webui/utils/tools.py captured a cookie jar from the enclosing connection loop instead of binding it to each external tool callable. When multiple tool servers were attached and a session or system OAuth connection was processed last, a request to a different server configured for bearer authentication could include the calling user's Open WebUI session cookies, allowing that server's operator to reuse the session and take over the account. This issue is fixed in version 0.11.1.

• CWE-201

• https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7Patch
• https://github.com/open-webui/open-webui/pull/28630Issue Tracking, Patch
• https://github.com/open-webui/open-webui/releases/tag/v0.11.1Release Notes
• https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7Exploit, Vendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7Exploit, Vendor Advisory

Published

Sep 9, 2026

Last Modified

Sep 15, 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.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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