Cross-site scripting in Open WebUI - #VU129658
Published: May 5, 2026
Vulnerability identifier: #VU129658
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open WebUI
Affected software:
Open WebUI
Open WebUI
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript in the browser of another user.
The vulnerability exists due to cross-site scripting in model description rendering in the chat UI when processing a crafted model description containing a javascript: link. A remote user can create a malicious model description to execute arbitrary JavaScript in the browser of another user.
User interaction is required, and the victim must view the malicious model and click the rendered hyperlink.
Remediation
Install security update from vendor's website.