CVE-2026-42887

Audiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message

State: Published
Severity: 4.5 Medium
Published: May 11, 2026
Updated: May 12, 2026
Reserved: Apr 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.5 Medium	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
audiobookshelfadvplyr	< 2.33.0Affected

References

https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-cx29-ghq2-9cm4

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