CVE-2026-42887

Name: CVE-2026-42887
Creator: NVD / NIST
Published: 2026-05-11T20:25:45.713+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.5/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-42887 is a medium-severity vulnerability rated 4.5/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.5/10

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

EPSS Probability

0.21%

10.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

References

Timeline

Published: May 11, 2026
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2026-42887?

How severe is CVE-2026-42887?

CVE-2026-42887 has a CVSS score of 4.5/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42887?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42887?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST