Cross-site scripting in Open WebUI - #VU130936

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU130936

Cross-site scripting in Open WebUI - #VU130936

Published: May 11, 2026


Vulnerability identifier: #VU130936
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

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary script in a victim's browser.

The vulnerability exists due to improper neutralization of input during web page generation in Office file preview rendering in FilePreview.svelte and FileItemModal.svelte when rendering HTML converted from user-supplied Office, Excel, or DOCX files via Svelte {@html} without DOMPurify sanitization. A remote user can upload a specially crafted document and have it rendered during file preview to execute arbitrary script in a victim's browser.

User interaction is required when a user previews the crafted file, and shared multi-user instances are especially exposed because the malicious file is stored server-side and can affect each viewer.


Remediation

Install security update from vendor's website.

Sources