What’s Vulnerable › Vulnerabilities

CVE-2026-109292: Open WebUI 0.6.27 before 0.11.4 Session Token Disclosure via OAuth-Mode Connections

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-15
• Weakness: CWE-200

Description

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.

Affected products

• open-webui: from 0.6.27 before 0.11.4 — fixed in 0.11.4

How to fix

Upgrade to a fixed version: open-webui 0.11.4. Check the vendor advisory for mitigations.

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
• https://github.com/open-webui/open-webui/security/advisories/GHSA-gqfh-jxvw-74rp

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