What is CVE-2026-27963?

CVE-2026-27963 is a medium-severity vulnerability in Advplyr Audiobookshelf, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-02-26.

How severe is CVE-2026-27963?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Advplyr Audiobookshelf

CVE-2026-27963

Audiobookshelf is a self-hosted audiobook and podcast server. A stored cross-site scripting (XSS) vulnerability exists in versions prior to 2.32.0 of the Audiobookshelf web application that allows arbitrary JavaScript execution through malicious library metadata. Attackers with library modification privileges can execute code in victim users' browsers, potentially leading to session hijacking and data exfiltration. Version 2.32.0 contains a patch for the issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-02-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (22.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Advplyr Audiobookshelf — versions < 2.32.0
Audiobookshelf

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/advplyr/audiobookshelf/security/advisories/GHSA-69cp-m725-wf78 (Exploit, Patch, Mitigation, Vendor Advisory)
github.com/advplyr/audiobookshelf/commit/503f4611b221a5bde19024e657021670df2044… (Patch)

Frequently asked questions

What is CVE-2026-27963?: CVE-2026-27963 is a medium-severity vulnerability in Advplyr Audiobookshelf, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-02-26.
How severe is CVE-2026-27963?: Medium severity. CVSS v3 base score is 4.8 out of 10.