Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

CVE-2026-45351Open WebUI: Exposure of System Prompt to Regular User [Non-Admin]

Medium 6.5

In plain English

A medium-severity information exposure in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 79.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.8.9	GHSA-jh9g-8jqw-m2qx
PyPI	open-webui	0.8.9	PYSEC-2026-2741

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.8.9

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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