Information disclosure in Open-Webui
CVE-2026-109292
Open WebUI from 0.6.27 before 0.11.4 contains an information disclosure vulnerability that allows destination servers to obtain user session cookies by receiving the full browser cookie jar on OAuth-mode connections. Operators of OpenAI-compatible connections, OpenAPI tool servers or terminal servers can capture forwarded session cookies from routine requests and replay them to hijack accounts, including administrators.
Vulnerability class: Information Disclosure
Published .
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
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-gqfh-jxvw-74rp (vendor-advisory)
- github.com/open-webui/open-webui/commit/f9f815c86220f809fad5ee1300c44f55dea74c79 (patch)
- github.com/open-webui/open-webui/commit/b71744b17823f7a3a9a64cb363e79a7164ed5b23 (patch)
- github.com/open-webui/open-webui/commit/3cda47cdb449aac970426f0929c9e5f8bb8bd807 (patch)
- www.vulncheck.com/advisories/open-webui-0.6.27-before-0.11.4-session-token-disc… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109292?
- CVE-2026-109292 is a medium-severity vulnerability in Open-Webui, classified under Information Disclosure. CVSS score: 6.8/10. Published 2026-10-12.
- How severe is CVE-2026-109292?
- Medium severity. CVSS v3 base score is 6.8 out of 10.