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Filebrowser CVE-2026-25890

HIGH
Use of Incorrectly-Resolved Name or Reference (CWE-706)
2026-02-09 security-advisories@github.com GHSA-4mh3-h929-w968
Authentication Bypass Filebrowser Suse
8.1
CVSS 3.1 · GitHub Advisory
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate as regular user
  2. Exploit
    Craft URL with double slashes in path
  3. Execution
    Bypass authorization rules
  4. Impact
    Access restricted files outside allowed directory

Vulnerability Assessment

Weakness
CWE
CWE-706
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Incorrectly specified target
Exploitation Conditions

Authenticated user account required. File Browser versions prior to 2.57.1 with 'Disallow' file path rules configured. Double slash path traversal (e.g., //private/) must be processed differently by authorization check versus filesystem resolution.
Impact

CVSS 8.1 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitation no authentication required. Public exploit/POC available.
Exploit ScenarioDerived

An attacker without authentication could exploit this vulnerability to compromise the affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Path normalization bypass in Filebrowser prior to 2.57.1 allows authenticated users to circumvent file access restrictions by injecting multiple slashes into request URLs, enabling unauthorized access to files designated as restricted. The vulnerability exploits a mismatch between the authorization validation logic and filesystem path resolution, affecting users running vulnerable versions. Public exploit code exists for this high-severity issue.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:54 CVSS 8.1

Filebrowser versions up to 2.57.1 is affected by use of incorrectly-resolved name or reference (CVSS 8.1).

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 2.57.1.. Restrict network access to the affected service where possible.

Affected Packages

go github.com/filebrowser/filebrowser no fix
go github.com/filebrowser/filebrowser/v2 fix: 2.57.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in go

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Technical ContextAI · show details

This vulnerability (CWE-706: Use of Incorrectly-Resolved Name or Reference) affects Filebrowser. File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vuln

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

GitHub Advisory PRIMARY 8.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
SUSE HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
PoC Detected
Feb 20, 2026 - 20:31 vuln.today
Public exploit code
Patch released
Feb 20, 2026 - 20:31 nvd
Patch available
CVE Published
Feb 09, 2026 - 22:16 nvd
HIGH 8.1

DescriptionGitHub Advisory

File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vulnerability is fixed in 2.57.1.

Executive ViewAI

Why It Matters

A HIGH severity vulnerability in File Browser (CVE-2026-25890) allows authenticated users to bypass file access restrictions and view confidential files through URL manipulation. This affects any organization using File Browser versions prior to 2.57.1 and poses an immediate risk to data confidentiality, as internal users could access files intended to be restricted.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.0%
Top 99% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS Vendor GitHub

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.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact
High

Priority Score

60
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +40
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*

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Same weakness CWE-706 – Use of Incorrectly-Resolved Name or Reference

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CVE-2021-37144 CRITICAL POC
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CVE-2023-28643 HIGH POC
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CVE-2022-27778 HIGH POC
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Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
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CVE-2011-3544 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
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Vendor StatusVendor

SUSE

Severity: High
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

References

Advisories & patches
PATCH https://github.com/filebrowser/filebrowser/commit/489af403a19057f6b6b4b1dc0e48cbb26a202ef9 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0757/ REF https://github.com/filebrowser/filebrowser/releases/tag/v2.57.1

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