VulnerabilityAnalyzed

CVE-2026-25890

Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL.

HIGH 8.1EPSS 0.47%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 3.1: 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.47% probability · 39th percentile
CISA KEV: Not listed
Weakness: CWE-706, CWE-863
Affected: filebrowser/filebrowser
Source: security-advisories@github.com

References

https://github.com/filebrowser/filebrowser/commit/489af403a19057f6b6b4b1dc0e48cbb26a202ef9Patch
https://github.com/filebrowser/filebrowser/releases/tag/v2.57.1Product, Release Notes
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-4mh3-h929-w968Exploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.