CVE-2026-23849 — Observable Timing Discrepancy in Filebrowser
Severity
5.3MEDIUMNVD
EPSS
0.2%
top 57.55%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJan 19
Latest updateFeb 3
Description
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 retur…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NExploitability: 3.9 | Impact: 1.4
Affected Packages4 packages
Patches
🔴Vulnerability Details
4OSV▶
File Browser Vulnerable to Username Enumeration via Timing Attack in /api/login in github.com/filebrowser/filebrowser↗2026-02-03