Vulnerability in Open-Webui
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Open-Webui — versions >= 0.6.27, < 0.11.1
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/commit/cd9db21c5276807a2975ddba17cef369ad1114b7 (Patch)
- github.com/open-webui/open-webui/pull/28630 (Patch, Issue Tracking)
- github.com/open-webui/open-webui/releases/tag/v0.11.1 (Release Notes)
- github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-87015?
- CVE-2026-87015 is a medium-severity vulnerability in Open-Webui, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.8/10. Published 2026-09-09.
- How severe is CVE-2026-87015?
- Medium severity. CVSS v3 base score is 6.8 out of 10.