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CVE-2026-42885— Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file existence

CVSS 4.3 · Medium EPSS 0.04% · P12

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProductVersion RangeStatus
advplyraudiobookshelf< 2.33.2affected
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I. Basic Information for CVE-2026-42885

Vulnerability Information
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Vulnerability Title
Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file existence
Source: NVD (National Vulnerability Database)
Vulnerability Description
Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.32.2, the POST /api/filesystem/pathexists endpoint uses String.startsWith() to validate that a resolved file path is within a library folder. This check fails for sibling directories whose names share a common prefix (e.g., /audiobooks vs /audiobooks-private), allowing authenticated users with upload permission to probe file existence outside their authorized library folder boundaries. 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:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Audiobookshelf 路径遍历漏洞
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之前版本存在路径遍历漏洞，该漏洞源于路径存在检查使用String.startsWith验证路径，导致经过身份验证的用户可探测库文件夹边界外的文件存在性。
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 < 2.33.2 -

II. Public POCs for CVE-2026-42885

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III. Intelligence Information for CVE-2026-42885

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

CVE-2026-428836.5 MEDIUMAudiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint
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-2026-428844.3 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-22

V. Comments for CVE-2026-42885

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