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CVE-2026-42887— Audiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message

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 2.33.0之前版本存在跨站脚本漏洞，该漏洞源于登录页面未正确清理authLoginCustomMessage字段，导致存储型跨站脚本攻击。

CVSS 4.5 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
advplyr audiobookshelf < 2.33.0 affected
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I. Basic Information for CVE-2026-42887

Vulnerability Information
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Vulnerability Title
Audiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message
Source: CVE Program / CVE List V5
Vulnerability Description
Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.33.0, a stored cross-site scripting (XSS) vulnerability exists in the Login Page due to improper sanitization of the authLoginCustomMessage field of the /api/auth-settings endpoint. An attacker with administrative privileges can inject arbitrary HTML/JavaScript that will be rendered on the login page for all users. This vulnerability is fixed in 2.33.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Audiobookshelf 跨站脚本漏洞
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 2.33.0之前版本存在跨站脚本漏洞，该漏洞源于登录页面未正确清理authLoginCustomMessage字段，导致存储型跨站脚本攻击。
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 < 2.33.0 -

II. Public POCs for CVE-2026-42887

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III. Intelligence Information for CVE-2026-42887

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Vendor Advisories for CVE-2026-42887 (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-2026-42885 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-79

V. Comments for CVE-2026-42887

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