medium6.8
CVE-2026-87015
Open WebUI: A user's session cookies are sent to tool servers configured for bearer authentication
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | open-webui | >= 0.6.27, < 0.11.1 | 0.11.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openwebui | Open Webui | from 0.6.27 before 0.11.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-p78m-89r6-pgf7
- https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7
- https://nvd.nist.gov/vuln/detail/CVE-2026-87015
- https://github.com/open-webui/open-webui/pull/28630
- https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1