What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-11 · updated 2026-10-26
• Weakness: CWE-863

Description

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 products

• advplyr audiobookshelf: before 2.32.2

References

• https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-6rvg-w3f5-9gq5
• https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-6rvg-w3f5-9gq5

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