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TI-2026-31089 Aliases CVE-2026-42883

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

Priority MEDIUM 62CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00255 17th percentileScored 2026-11-07
Fix Fixed audiobookshelf (advplyr): 2.32.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
advplyraudiobookshelfbefore 2.32.22.32.2Patch availableCNA
  • audiobookshelf Vendoradvplyr Affected before 2.32.2 Fixed in 2.32.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:audiobookshelf:audiobookshelf:*:*:*:*:*:*:*:*——advplyr
  • cpe:2.3:a:audiobookshelf:audiobookshelf:*:*:*:*:*:*:*:* Versions — — ·advplyr

Remediation

  • Fix · CNA audiobookshelf (advplyr) Fixed in 2.32.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42883

References

Other 1

  • TI-2025-18874 Remote Authentication-Bypass can lead to server crash or limited information disclosure due to faulty pattern matching CVSS 3.1HIGH 8.2
  • TI-2025-35683 Audiobookshelf vulnerable to OIDC token exfiltration and account takeover CVSS 3.1HIGH 8.8
  • TI-2026-49884 Path traversal in advplyr audiobookshelf CVSS 3.1HIGH 7.5
  • TI-2025-29079 Audiobookshelf Vulnerable to Cross-Site-Scripting Reflected via POST Request in /api/upload CVSS 4.0MEDIUM 6.9
  • TI-2023-25761 Audiobookshelf Server-Side Request Forgery and Arbitrary File Read Vulnerability CVSS 3.1HIGH 8.1
  • TI-2024-29391 Path Traversal in audiobookshelf CVSS 3.1MEDIUM 6.3
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences