Vulnerability 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 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Filebrowser | Filebrowser | < 2.55.0 |
Related Weaknesses (CWE)
References
- https://github.com/filebrowser/filebrowser/commit/24781badd413ee20333aba5cce1919Patch
- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-43mm-m3h2-3pExploitVendor Advisory
FAQ
What is CVE-2026-23849?
CVE-2026-23849 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 co...
How severe is CVE-2026-23849?
CVE-2026-23849 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23849?
Check the references section above for vendor advisories and patch information. Affected products include: Filebrowser Filebrowser.