CVE-2026-42885 — Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file existence
Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.32.2, the POST /api/filesystem/pathexists endpoint uses String.startsWith() to validate that a resolved …
Published: 2026-05-11 · CVSS: 4.3 · CVSS 3.1
Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.32.2, the POST /api/filesystem/pathexists endpoint uses String.startsWith() to validate that a resolved file path is within a library folder. This check fails for sibling directories whose names share a common prefix (e.g., /audiobooks vs /audiobooks-private), allowing authenticated users with upload permission to probe file existence outside their authorized library folder boundaries. This vulnerability is fixed in 2.32.2.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7