CVE-2026-25890
File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL
- Published
- Feb 9, 2026
- Updated
- Feb 10, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NLow · next 30 days
- Percentile
- 39.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Exploit for CVE-2026-25890, a path-based authorization bypass in FileBrowser <= v2.57.0, allowing authenticated low-privileged users to read, upload, and delete restricted files via multiple leading slashes.
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