What is CVE-2026-42887?

CVE-2026-42887 is a medium-severity vulnerability in Advplyr Audiobookshelf, classified under Cross-site Scripting. CVSS score: 4.5/10. Published 2026-05-11.

How severe is CVE-2026-42887?

Medium severity. CVSS v3 base score is 4.5 out of 10.

XSS in Advplyr Audiobookshelf

CVE-2026-42887

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-set…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (9.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N.

Affected products

Advplyr Audiobookshelf — versions < 2.33.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42887?: CVE-2026-42887 is a medium-severity vulnerability in Advplyr Audiobookshelf, classified under Cross-site Scripting. CVSS score: 4.5/10. Published 2026-05-11.
How severe is CVE-2026-42887?: Medium severity. CVSS v3 base score is 4.5 out of 10.