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

Quick assessment

Affected
advplyr audiobookshelf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 6.5 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
advplyr audiobookshelf < 2.32.2 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
advplyr audiobookshelf < 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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Vendor Advisories for CVE-2026-42883 (1)

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

CVE-2026-42886 4.9 MEDIUM Audiobookshelf: Memory amplification DoS via oversized compressed details entry in backup
CVE-2026-42887 4.5 MEDIUM Audiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message
CVE-2026-42885 4.3 MEDIUM Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file e
CVE-2026-42884 4.3 MEDIUM Audiobookshelf: Collection endpoints bypass library access controls exposing restricted li
CVE-2026-42888 Audiobookshelf: 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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