CVE-2026-45351

Open WebUI: Exposure of System Prompt to Regular User [Non-Admin]

State: Published
Severity: 6.5 Medium
Published: May 15, 2026
Updated: May 18, 2026
Reserved: May 11, 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.9, when a regular user [non-admin] logs into the application, a http://IP:8080/api/models? web request is initiated by the application and in response, it reveals the system prompt of available models set by admin on models pages in workspace affecting the confidentiality of application. This vulnerability is fixed in 0.8.9.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
open-webuiopen-webui	< 0.8.9Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-jh9g-8jqw-m2qx

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