# CVE-2026-109292: Open WebUI session cookie leakage in OAuth mode

Source: https://junglewise.ai/threats/cve-2026-109292-open-webui-from-0-6-27-before-0-11-4-contains-an-information  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-109292 · Severity: medium · CVSS 6.8 · Published 2026-10-12

Open WebUI is a web interface for interacting with AI models. Versions 0.6.27 through 0.11.3 send user session cookies to destination servers (like OpenAI, tool servers, or terminal servers) when configured in OAuth mode, allowing operators of those servers to capture and replay cookies to hijack user accounts, including administrator accounts.

Technologies: [Open WebUI](https://junglewise.ai/threats/technologies/open-webui-open-webui). Vendors: [Open WebUI](https://junglewise.ai/threats/vendors/open-webui).

## Quick answers

**Is CVE-2026-109292 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109292 being exploited in the wild.

**How severe is CVE-2026-109292?** Medium severity, with a CVSS score of 6.8, published 12 October 2026.

**Which products and versions are affected?** Open WebUI 0.6.27 to 0.11.3.

**Is there a fix for CVE-2026-109292?** Yes: fixed in 0.11.4. Until then: Avoid connecting to untrusted OpenAI-compatible servers, OpenAPI tool servers, or terminal servers until upgrading. Configure connections to only trusted third-party services.</anigation>
<parameter name="timeline">[{"kind":"disclosed", "at":"2026-10-12"}] Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109292 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-109292?** Check whether you run Open WebUI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 0.11.4

Avoid connecting to untrusted OpenAI-compatible servers, OpenAPI tool servers, or terminal servers until upgrading. Configure connections to only trusted third-party services.</anigation>
<parameter name="timeline">[{"kind":"disclosed", "at":"2026-10-12"}]

## Technical details

The vulnerability occurs in the header-building logic for connections to external servers, where the application unconditionally includes all browser cookies in requests to destination services when OAuth is enabled. An attacker operating any connected external server (OpenAI-compatible API, OpenAPI tool server, or terminal server) can extract session cookies from routine requests and use them to impersonate users. The fix restricts cookie forwarding to only connections that explicitly opt in via a 'forward_cookies' configuration flag.

## Affected products

- Open WebUI Open WebUI 0.6.27 to 0.11.3

## References

- [https://github.com/open-webui/open-webui/commit/3cda47cdb449aac970426f0929c9e5f8bb8bd807](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/b71744b17823f7a3a9a64cb363e79a7164ed5b23)

## Related threats

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- [Open WebUI denial of service in recurrence rule validation](https://junglewise.ai/threats/cve-2026-109299-open-webui-from-0-9-0-before-0-11-4-contains-a-denial-of-service)
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- [Open WebUI automation recurrence-rule denial of service](https://junglewise.ai/threats/cve-2026-109297-open-webui-0-11-0-before-0-11-4-contains-a-denial-of-service)
- [Open WebUI missing authorization in model provider routes](https://junglewise.ai/threats/cve-2026-109296-open-webui-before-0-11-4-contains-a-missing-authorization)