Stored XSS in File Browser SPA via Admin Branding Fields

Publication date: 2026-04-01

Last updated on: 2026-04-06

Assigner: GitHub, Inc.

Description

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the SPA index page in File Browser is vulnerable to Stored Cross-Site Scripting (XSS) via admin-controlled branding fields. An admin who sets branding.name to a malicious payload injects persistent JavaScript that executes for ALL visitors, including unauthenticated users. This issue has been patched in version 2.62.2.

CVSS Scores

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Meta Information

Published

2026-04-01

Last Modified

2026-04-06

Generated

2026-07-06

AI Q&A

2026-04-02

EPSS Evaluated

2026-07-05

NVD

CVE-2026-34530

Affected Vendors & Products

Vendor	Product	Version / Range
filebrowser	filebrowser	to 2.62.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

The vulnerability in File Browser prior to version 2.62.2 is a Stored Cross-Site Scripting (XSS) issue affecting the SPA index page. An administrator can inject malicious JavaScript code into the branding.name field, which is then persistently stored and executed for all visitors to the page, including those who are not authenticated.

Impact Analysis

This vulnerability allows an attacker with admin privileges to inject persistent malicious scripts that execute in the browsers of all visitors to the File Browser interface. This can lead to unauthorized actions such as stealing user credentials, session hijacking, or performing actions on behalf of users, potentially compromising the security and integrity of the system and its users.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade File Browser to version 2.62.2 or later, where the Stored Cross-Site Scripting (XSS) issue has been patched.

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