CVE-2026-87015
mediumOpen WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform.
Vendor / product: Openwebui — open webui
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7 security-advisories@github.com
- https://github.com/open-webui/open-webui/pull/28630 security-advisories@github.com
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1 security-advisories@github.com
- https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7 security-advisories@github.com
- https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7 134c704f-9b21-4f2e-91b3-4a467353bcc0