PT-2026-39750 · Unknown · Audiobookshelf

Bugbunny-Research · CVE-2026-42885 · Published 2026-05-11 · Updated 2026-05-11

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Audiobookshelf versions prior to 2.32.2

Description The POST '/api/filesystem/pathexists' endpoint uses the String.startsWith() function to validate that a resolved file path remains within a library folder. This validation is insufficient for sibling directories that share a common prefix, such as '/audiobooks' and '/audiobooks-private'. Consequently, authenticated users with upload permissions can probe for the existence of files outside their authorized library folder boundaries.

Recommendations Update to version 2.32.2.

Exploit

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-42885

GHSA-RHJG-P6CM-38W2

Affected Products

Audiobookshelf

References · 4

• 🔥 https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-rhjg-p6cm-38w2 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42885.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-42885 · Security Note
• https://osv.dev/vulnerability/CVE-2026-42885 · Vendor Advisory