CVE-2026-42887 | BDVDB-2026-332145 Detail

advplyraudiobookshelf

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

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

References#

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

Exploit#

No public exploit known

History#

Version 12026-05-11Record published in the CVE List.
Version 22026-05-12Most recent update recorded in the CVE List.

Published

Published: 2026-05-11
Last modified: 2026-05-12

Vendor information

Vendor: advplyr
Product: audiobookshelf

All advplyr vulnerabilities

Score

4.5 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 17.6.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 2.33.0
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.5 Medium

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).