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CVE-2026-71209— audiobookshelf - %2F Encoding Discrepancy Bypasses Cover/Image Auth Exemption Regex, Enabling Unauthenticated Path Traversal

Quick assessment

Affected
advplyr audiobookshelf
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

advplyr audiobookshelf是advplyr个人开发者的一款音频书籍管理平台。 advplyr audiobookshelf 2.19.1版本至2.35.1版本存在路径遍历漏洞，该漏洞源于认证豁免检查与路由参数解码不一致，未对%2F编码的路径进行有效验证，导致路径遍历，攻击者可未经身份验证读取任意文件。

CVSS 7.5 · High EPSS 1.93% · P79

Public Exploits 1

Nuclei · 1 CVE-2026-71209.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
advplyr audiobookshelf 2.19.1≤ 2.35.1 affected
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I. Basic Information for CVE-2026-71209

Vulnerability Information
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Vulnerability Title
audiobookshelf - %2F Encoding Discrepancy Bypasses Cover/Image Auth Exemption Regex, Enabling Unauthenticated Path Traversal
Source: CVE Program / CVE List V5
Vulnerability Description
audiobookshelf's authentication-exemption check (server/routers/Auth.js) matches unauthenticated-allowed GET routes against req.path via a regex requiring a literal /items/:id/cover or /authors/:id/image shape, where req.path retains %2F sequences URL-encoded. CacheManager.handleCoverCache then joins this decoded value into a cache file path and streams the result before any database-backed ownership check.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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
advplyr audiobookshelf 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
advplyr audiobookshelf是advplyr个人开发者的一款音频书籍管理平台。 advplyr audiobookshelf 2.19.1版本至2.35.1版本存在路径遍历漏洞，该漏洞源于认证豁免检查与路由参数解码不一致，未对%2F编码的路径进行有效验证，导致路径遍历，攻击者可未经身份验证读取任意文件。
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 2.19.1 ~ 2.35.1 -

II. Public POCs for CVE-2026-71209

# POC Description Source Link Shenlong Link
1 Audiobookshelf contains a path traversal caused by improper authentication-exemption check on URL-encoded paths in server/routers/Auth.js, letting unauthenticated attackers read arbitrary files, exploit requires crafted URL with encoded traversal sequences. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-71209.yaml POC Details
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8519 chars
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III. Intelligence Information for CVE-2026-71209

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Vendor Advisories for CVE-2026-71209 (1)

Other References for CVE-2026-71209 (1)

IV. Related Vulnerabilities

Same product: audiobookshelf
Same vendor: advplyr
Same weakness: CWE-22

V. Comments for CVE-2026-71209

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