CVE-2026-104748: SimpleForm <= 3.10.0 - Unauthenticated Privilege Escalation to wp_capabilities M

In plain English

A critical-severity privilege mismanagement in SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications from wpazleen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Official description

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.

Vendor	Product	Versions
wpazleen	SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications	0 – through 3.10.0

Vendor

Product

Versions

wpazleen

SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications

0 – through 3.10.0

CVE-2026-104748SimpleForm <= 3.10.0 - Unauthenticated Privilege Escalation to wp_capabilities Mass Assignment via simpleform_wp_register

In plain English

Official description

Affected products (as reported)

References