CVE-2026-4336 Ultimate FAQ Accordion Plugin <= 2.4.7 - Authenticated (Author+) Stored Cross-Site Scripting via FAQ Content

Q: What is CVE-2026-4336?

CVE-2026-4336 is a medium-severity cross-site scripting vulnerability in rustaurius Ultimate FAQ Accordion Plugin, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Medium 6.4 Published 9 Apr 2026 Updated 9 Apr 2026

Authenticated Authors can inject arbitrary scripts into FAQ content via entity encoding, leading to stored XSS execution for site visitors.

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-2026-4336?

CVE-2026-4336 is a medium-severity cross-site scripting vulnerability in rustaurius Ultimate FAQ Accordion Plugin, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Ultimate FAQ Accordion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via FAQ content in all versions up to, and including, 2.4.7. This is due to the plugin calling html_entity_decode() on post_content during rendering in the set_display_variables() function (View.FAQ.class.php, line 746), which converts HTML entity-encoded payloads back into executable HTML, combined with insufficient output escaping in the faq-answer.php template where the decoded content is echoed without wp_kses_post() or any other sanitization. The ufaq custom post type is registered with 'show_in_rest' => true and defaults to 'post' capability_type, allowing Author-level users to create and publish FAQs via the REST API. An Author can submit entity-encoded malicious HTML (e.g., <img src=x onerror=alert()>) which bypasses WordPress's kses sanitization at save time (since kses sees entities as plain text, not tags), but is then decoded back into executable HTML by html_entity_decode() at render time. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in FAQ pages that will execute whenever a user accesses an injected FAQ, either directly or via the [ultimate-faqs] shortcode.

Weakness: CWE-79

Which versions are affected by CVE-2026-4336?

How do I fix CVE-2026-4336?

No fix has been published for CVE-2026-4336 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-2026-4336 being exploited?

There is no known exploitation of CVE-2026-4336 in the wild and no public exploit code.

Sources

Also known as GHSA-xcgq-hf5p-j85h.