Cloudanix VulnDB

CVE-2026-23849

Medium · 5.3

CVSS

5.3

EPSS

0.5%

Published

Jan 19, 2026

CISA due date

—

The record

File Browser provides a file managing interface within a specified directory and can be used to upload, delete, preview, rename, and edit files. Prior to version 2.55.0, the JSONAuth. Auth function contains a logic flaw that allows unauthenticated attackers to enumerate valid usernames by measuring the response time of the /api/login endpoint. The vulnerability exists due to a "short-circuit" evaluation in the authentication logic. When a username is not found in the database, the function returns immediately. However, if the username does exist, the code proceeds to verify the password using bcrypt (users.CheckPwd), which is a computationally expensive operation designed to be slow. This difference in execution path creates a measurable timing discrepancy. Version 2.55.0 contains a patch for the issue.

Affected packages

Ecosystem Package Introduced Fixed
Go github.com/filebrowser/filebrowser 0 No fix
Go github.com/filebrowser/filebrowser/v2 0 2.55.0
Chainguard filebrowser 0 2.56.0-r0
Chainguard filebrowser-compat 0 2.54.0-r0
Chainguard filebrowser-compat 0 2.56.0-r0
Wolfi filebrowser 0 2.56.0-r0
Wolfi filebrowser-compat 0 2.54.0-r0
Wolfi filebrowser-compat 0 2.56.0-r0
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20260205T172317-150000.1.146.1

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