Vulnerability Description
The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.29.9. The vulnerability exists because `ActionUser::conditions_logic()` gates the `current_user_can('edit_user', $user_id)` authorization check behind an `is_numeric()` test, causing the check to be skipped entirely when `$user_id` is a non-numeric string — a condition that can be induced by passing a crafted value such as `1one` through the unvalidated `item_id` parameter of the unauthenticated `wp_ajax_nopriv_frontend_admin/forms/change_form` AJAX endpoint. This makes it possible for attackers to escalate privileges to administrator by obtaining a server-signed `_acf_objects` payload carrying the non-numeric user ID, which WordPress subsequently coerces to integer 1 (the default administrator), allowing the attacker to overwrite that account's password or email address. Exploitation by unauthenticated users requires a public-facing frontend user form to be configured; in all other cases a subscriber-level account is sufficient.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.3
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.3
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.3
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.3
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.3
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.9
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.9
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.9
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.9
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.9
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3633030%40acf-fronten
- https://www.wordfence.com/threat-intel/vulnerabilities/id/01404fad-7b5a-485a-b55
FAQ
What is CVE-2026-18432?
CVE-2026-18432 is a vulnerability with a CVSS score of 9.8 (CRITICAL). The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.29.9. The vulnerability exists because `ActionUser::conditions_logic...
How severe is CVE-2026-18432?
CVE-2026-18432 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-18432?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.