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CVE-2026-25890

File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL

Published: Feb 9, 2026Updated: Feb 20, 2026 Sources: CVE List NVD GHSACWE-706
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.5%
Top 63.6%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-706CWE-863

Affected Products

filebrowserfilebrowser
On-prem
Web & CMS Plugins / site-builder
github.com/filebrowser/filebrowser/v2GoOSS Libraries
filebrowseross-projectWeb & CMS Pluginsaka filebrowser
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/filebrowser/filebrowser/commit/489af403a19057f6b6b4b1dc0e48cbb26a202ef9
github.com
https://github.com/filebrowser/filebrowser/releases/tag/v2.57.1
github.com
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-4mh3-h929-w968
github.com
and 2 more references View all →

Timeline

Published
Feb 9, 2026
Last Updated
Feb 20, 2026

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