Filebrowser
CVE-2026-23849
MEDIUM
GHSA-43mm-m3h2-3prc
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V6 - Authentication Timing attack prevention
|
| Impact | CVSS 5.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker without authentication could exploit this vulnerability to enumerate valid usernames by measuring the response time of the /api/login endpo. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Filebrowser versions up to 2.55.0 contains a vulnerability that allows attackers to enumerate valid usernames by measuring the response time of the /api/login endpo (CVSS 5.3).
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in go
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
affects Filebrowser. 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
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
Executive ViewAI
CVE-2026-23849 presents moderate security risk rated CVSS 5.3. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)GitHub Advisory
More in Filebrowser
View allUnauthorized file operations in File Browser before fix. PoC and patch available.
A cross-site scripting (XSS) vulnerability in FileBrowser before v2.23.0 allows an authenticated attacker to escalate pr
Symlink-following read paths in FileBrowser Quantum serve files from outside a user's assigned scope: download, preview,
Recursive operation authorization bypass in File Browser before v2.63.22 permits any authenticated user to copy, rename,
Path normalization bypass in Filebrowser prior to 2.57.1 allows authenticated users to circumvent file access restrictio
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, previ
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, previ
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, previ
Arbitrary file read in FileBrowser Quantum (gtsteffaniak/filebrowser) before 1.4.3-beta lets any authenticated user, reg
File Browser versions 2.50.0 through 2.63.21 permit indefinite session persistence via expired JWT tokens when proxy aut
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, previ
Arbitrary file deletion in filebrowser before 2.63.19 allows authenticated users holding only Create permission to delet
Same weakness CWE-208 – Observable Timing Discrepancy
View allSame technique Information Disclosure
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
Exploit-DB