github.comConfirmation
https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-rhjg-p6cm-38w2 CVE-2026-42885
MEDIUM
Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file existence
Record summary
CVE-2026-42885 has a selected CVSS score of 4.3 (medium).
Description
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationPoC
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated May 11, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
audiobookshelfBrowse advplyr / audiobookshelf | CVE List | < 2.33.2 | affected |