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

CVSS 6.5 · Medium EPSS 0.03% · P9

Possible ATT&CK Techniques 1AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProductVersion RangeStatus
advplyraudiobookshelf< 2.32.2affected
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I. Basic Information for CVE-2026-42883

Vulnerability Information
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Vulnerability Title
Audiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Audiobookshelf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Audiobookshelf是Audiobookshelf开源的一个自托管的有声读物和播客服务器。 Audiobookshelf 2.32.2之前版本存在安全漏洞，该漏洞源于下载端点未将可下载项限制在指定库内，导致经过身份验证的用户可获取其他库的文件内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
advplyraudiobookshelf < 2.32.2 -

II. Public POCs for CVE-2026-42883

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III. Intelligence Information for CVE-2026-42883

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Same Patch Batch · advplyr · 2026-05-11 · 6 CVEs total

CVE-2026-428864.9 MEDIUMAudiobookshelf: Memory amplification DoS via oversized compressed details entry in backup
CVE-2026-428874.5 MEDIUMAudiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message
CVE-2026-428854.3 MEDIUMAudiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file e
CVE-2026-428844.3 MEDIUMAudiobookshelf: Collection endpoints bypass library access controls exposing restricted li
CVE-2026-42888Audiobookshelf: Path Traversal vulnerability in the audiobookshelf project

IV. Related Vulnerabilities

Same product: audiobookshelf
Same vendor: advplyr
Same weakness: CWE-863

V. Comments for CVE-2026-42883

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