CVE-2026-35605: File Browser has an access rule bypass via HasPrefix without trailing separator in path matching

April 8, 2026

Hi,

The Matches() function in rules/rules.go uses strings.HasPrefix() without a trailing directory separator when matching paths against access rules. A rule for /uploads also matches /uploads_backup/, granting or denying access to unintended directories. Verified against v2.62.2 (commit 860c19d).

References

github.com/advisories/GHSA-5q48-q4fm-g3m6
github.com/filebrowser/filebrowser
github.com/filebrowser/filebrowser/pull/5889
github.com/filebrowser/filebrowser/security/advisories/GHSA-5q48-q4fm-g3m6
nvd.nist.gov/vuln/detail/CVE-2026-35605

Code Behaviors & Features

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