CVE-2026-4084 Cross-site scripting in fyyd podcast shortcodes
Authenticated attackers can inject arbitrary scripts via shortcode attributes, leading to code execution and potential account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4084?
CVE-2026-4084 is a medium-severity cross-site scripting vulnerability in cbednarek fyyd podcast shortcodes, published on 21 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-4084?
How do I fix CVE-2026-4084?
No fix has been published for CVE-2026-4084 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-4084 being exploited?
There is no known exploitation of CVE-2026-4084 in the wild and no public exploit code.
Sources
Also known as GHSA-fm6h-hmg3-46c3.