Stored Cross-Site Scripting Vulnerability in Audiobookshelf by Audiobookshelf Team
CVE-2026-42887

4.5MEDIUM

Key Information:

Vendor

Advplyr

Status
Audiobookshelf
Vendor
CVE Published:
11 May 2026

What is CVE-2026-42887?

Audiobookshelf, a self-hosted audiobook and podcast server, contains a stored cross-site scripting vulnerability on its Login Page due to the improper sanitization of the 'authLoginCustomMessage' field within the /api/auth-settings endpoint. An attacker with administrative privileges can exploit this flaw to inject arbitrary HTML or JavaScript, which would subsequently be executed on the login page for all users, potentially leading to severe security breaches. This issue was addressed in version 2.33.0.

Affected Version(s)

audiobookshelf < 2.33.0

References

https://github.com/advplyr/audiobookshelf/security/adviso...
x_refsource_CONFIRM

CVSS V3.1

Score:
4.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.