CVE-2026-42883 MEDIUM

CVE-2026-42883: Audiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint

Vendor Advplyr
Product audiobookshelf
Weakness CWE-863 · Incorrect authorization
Published May 11, 2026
Last update May 12, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.32.2, the GET /api/libraries/:id/download endpoint validates that the requesting user has access to the library specified in the URL path, but fetches downloadable items solely by attacker-provided IDs without constraining them to that library. An authenticated user with download permission and access to any one library can exfiltrate the full file contents of items belonging to any other library, including libraries they are explicitly denied access to. This vulnerability is fixed in 2.32.2.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 12, 2026 Record updated