Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

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。

CVSS 4.3 · Medium EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
advplyr audiobookshelf < 2.33.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-42885

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file existence
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
advplyr audiobookshelf < 2.33.2 -

II. Public POCs for CVE-2026-42885

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-42885

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-42885 (1)

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

CVE-2026-42883 6.5 MEDIUM Audiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint
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-2026-42884 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-22

V. Comments for CVE-2026-42885

No comments yet

Leave a comment