What is CVE-2026-4084?

CVE-2026-4084 is a medium-severity vulnerability in Cbednarek Fyyd Podcast Shortcodes, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-21.

How severe is CVE-2026-4084?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Cbednarek Fyyd Podcast Shortcodes

CVE-2026-4084

The fyyd podcast shortcodes plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'fyyd-podcast', 'fyyd-episode', and 'fyyd' shortcodes in all versions up to, and including, 0.3.1. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes such as 'color', 'podcast_id', and 'podcast_slug'. These attributes are directly concatenated into inline JavaScript within single-quoted string arguments without any escaping or sanitization, allowing an attacker to break out of the JavaScript string context. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (16.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Cbednarek Fyyd Podcast Shortcodes — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-4084?: CVE-2026-4084 is a medium-severity vulnerability in Cbednarek Fyyd Podcast Shortcodes, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-21.
How severe is CVE-2026-4084?: Medium severity. CVSS v3 base score is 6.4 out of 10.