Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in FileBrowser - CVE-2026-34530
Published: April 8, 2026
Vulnerability identifier: #VU125396
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34530
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: File Browser
Affected software:
FileBrowser
FileBrowser
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary script in victims' browsers.
The vulnerability exists due to cross-site scripting in the SPA index page branding template when rendering admin-controlled branding fields with Go's text/template. A remote privileged user can set a specially crafted branding value to execute arbitrary script in victims' browsers.
User interaction is required to load the affected page, and the injected script is stored persistently and can affect unauthenticated visitors.
How to mitigate CVE-2026-34530
Install security update from vendor's website.