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.

CVSS 4.0

7.6CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-25)

CWE

CWE-200

Published

2026-10-12

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

References

• https://github.com/open-webui/open-webui/commit/3cda47cdb449aac970426f0929c9e5f8bb8bd807
• https://github.com/open-webui/open-webui/commit/b71744b17823f7a3a9a64cb363e79a7164ed5b23
• https://github.com/open-webui/open-webui/commit/f9f815c86220f809fad5ee1300c44f55dea74c79
• https://github.com/open-webui/open-webui/security/advisories/GHSA-gqfh-jxvw-74rp
• https://www.vulncheck.com/advisories/open-webui-0.6.27-before-0.11.4-session-token-disclosure-via-oauth-mode-connections

Check your stackJSON