The SimpleForm – Form Maker to Chat Apps with Quiz Privilege Escalation Flaw CVE-2026-104748 Disclosed

The SimpleForm – Form Maker to Chat Apps with Quiz is affected by CVE-2026-104748, rated 9.8 (critical). No in-the-wild exploitation has been confirmed in the CISA KEV catalog at the time of writing.

What the flaw is

The NIST National Vulnerability Database describes it as follows:

The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.10.0 This is due to the `wp_ajax_nopriv_simpleform_wp_register` AJAX action lacking any capability check for role assignment and the `save_custom_fields_to_user_meta()` function using an exclusion list that omits `wp_capabilities`, combined with `get_form_settings()` returning a hard-coded defaults array that unconditionally enables meta writing regardless of the supplied `form_id`. This makes it possible for unauthenticated attackers to create a new Administrator-level WordPress account by supplying `wp_capabilities[administrator]=1` alongside standard registration fields. The nonce required by the endpoint is publicly emitted into the `front_end_data` JavaScript object on every front-end page via `wp_enqueue_scripts`, making it trivially obtainable by any unauthenticated visitor before submitting the malicious request.

At a glance

What defenders should do

• Patch: apply the fixed release from The; check the vendor advisory linked below for the exact versions.
• Inventory: identify every instance of The SimpleForm – Form Maker to Chat Apps with Quiz, prioritising internet-facing ones.