Cross-site scripting in Open WebUI - #VU140756
Published: August 3, 2026
Vulnerability identifier: #VU140756
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute script in the application origin and take over a victim account.
The vulnerability exists due to cross-site scripting in the terminal file preview iframe in FilePreview.svelte when rendering HTML files served through the terminal file preview path. A remote user can cause a crafted HTML file to be previewed to execute script in the application origin and take over a victim account.
Exploitation requires a configured and reachable terminal server, and no victim interaction beyond having the chat open because the preview opens automatically. Instances without a terminal server configured are not affected.
Affected software
Open WebUI
Remediation
Install security update from vendor's website.
Open WebUI - update to 0.11.0