| Component | Open WebUI |
| Severity | medium (CVSS 6.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| Published (NVD) | 2026-09-09 |
| Last modified | 2026-09-15 |
| Affected versions | open_webui >= 0.6.27, < 0.11.1 |
| Fixed in | 0.11.1 |
| Weakness | CWE-201 |
| CISA KEV | not listed |
NVD description
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.
What to do
- Upgrade Open WebUI to
0.11.1or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-87015
- https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7
- https://github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7
- https://github.com/open-webui/open-webui/pull/28630
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1
Read more
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