CVE-2026-25890

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

State: Published
Severity: 8.1 High
Published: Feb 9, 2026
Updated: Feb 10, 2026
Reserved: Feb 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-706 Use of Incorrectly-Resolved Name or Reference
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
filebrowserfilebrowser	< 2.57.2Affected

References

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