PT-2026-52537 · Filebrowser · Filebrowser

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-54089

Mitre

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Starting with 2.0.0-rc.1, when FileBrowser is configured with proxy authentication (auth.method=proxy), any unauthenticated attacker who can reach the server directly can impersonate any user - including admin - by sending a single forged HTTP header. No credentials are required. Additionally, specifying a non-existent username causes the server to automatically create a new user account, providing an account creation primitive with no authorization. This is an already known issue that has been documented in the documentation for several years, but has not been documented as a vulnerability before.

Exploit

Fix

Improper Authentication

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-287

CWE-290

Related Identifiers

CVE-2026-54089

Affected Products

Filebrowser

References · 4

• 🔥 https://github.com/filebrowser/filebrowser/security/advisories/GHSA-xqp3-jq6g-x3qm · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-54089 · Security Note
• https://github.com/filebrowser/filebrowser/blob/main/auth/proxy.go · Note
• https://github.com/filebrowser/filebrowser/blob/main/http/auth.go#L121-L137 · Note