CVE-2026-42883: Audiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42883?
CVE-2026-42883 has a medium severity rating due to improper validation of user permissions.
How do I fix CVE-2026-42883?
To fix CVE-2026-42883, upgrade Audiobookshelf to version 2.32.2 or later.
What type of vulnerability is CVE-2026-42883?
CVE-2026-42883 is an access control vulnerability that allows unauthorized access to downloadable items.
What versions of Audiobookshelf are affected by CVE-2026-42883?
CVE-2026-42883 affects all versions of Audiobookshelf prior to 2.32.2.
Can CVE-2026-42883 be exploited remotely?
Yes, CVE-2026-42883 can be exploited remotely due to its reliance on user-provided IDs for access.