CVE-2026-4336 json
Ultimate FAQ Accordion Plugin <= 2.4.7 - Authenticated (Author+) Stored Cross-Site Scripting via FAQ Content
published 7mo ago modified 4mo ago also EUVD-2026-20845
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
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.
Is CVE-2026-4336 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- rustaurius Ultimate FAQ Accordion Plugin
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/5ac3ac02-d496-46cb-9aff-ffeeb8fd80fa?source=cve
- plugins.trac.wordpress.org /browser/ultimate-faqs/trunk/ewd-ufaq-templates/faq-answer.php#L2
- plugins.trac.wordpress.org /browser/ultimate-faqs/tags/2.4.7/ewd-ufaq-templates/faq-answer.php#L2
- plugins.trac.wordpress.org /browser/ultimate-faqs/trunk/views/View.FAQ.class.php#L746
- plugins.trac.wordpress.org /browser/ultimate-faqs/tags/2.4.7/views/View.FAQ.class.php#L746
- plugins.trac.wordpress.org /browser/ultimate-faqs/trunk/includes/CustomPostTypes.class.php#L84
- plugins.trac.wordpress.org /browser/ultimate-faqs/tags/2.4.7/includes/CustomPostTypes.class.php#L84
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3492083%40ultimate-faqs&new=3492083%40ultimate-faqs&sfp_email=&
Sources
- CVE List CVE-2026-4336
- NVD CVE-2026-4336
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.