Executive brief
The Forminator Forms WordPress plugin allows unauthenticated visitors to create new sites on a WordPress multisite network and become administrators of those sites, even when the network explicitly prohibits site creation. An attacker can use the plugin's registration form to bypass network restrictions, register a new site, and gain full administrative control, potentially compromising the entire site.
Technical details
The vulnerability is an authorization bypass (CWE-269) in the Forminator Forms plugin's user registration functionality. The plugin fails to verify that multisite network settings allow site creation before processing a signup request. An unauthenticated attacker can submit a registration form via the forminator_submit_form_custom-forms AJAX action, which creates a site signup even when the network is configured to forbid site registration. After email activation, the attacker gains administrator access to the newly created site. The flaw affects versions before 1.57.1 and has been patched in 1.57.1 and later.
Affected products
- Forminator Forminator Forms before 1.57.1
Timeline
- 2026-08-24: disclosed
- 2026-08-26: patched: Version 1.57.1 and later