Cross-site scripting in Open WebUI - #VU130240
Published: May 6, 2026
Vulnerability identifier: #VU130240
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 script in a victim's browser.
The vulnerability exists due to cross-site scripting in the excel file preview component when rendering a crafted XLSX attachment for preview. A remote user can upload and share a specially crafted XLSX file to execute arbitrary script in a victim's browser.
User interaction is required to open the file modal and select the preview tab, and the issue can be triggered through shared chats.
Remediation
Install security update from vendor's website.