Formidable Forms WordPress plugin: Arbitrary plugin installation via file_url parameter
The free version of the Formidable Forms WordPress plugin up to and including 6.35 allows authenticated users with subscriber-level access or higher to install arbitrary plugins on the server. The flaw lies in insufficient URL validation of the 'file_url' parameter and a permission check that relies only on a shared token obtainable through the frm_view_forms capability. Formidable Pro must not be installed for the attack to work. A successful attack can lead to a backdoor, data theft or website defacement.
Strategy11 · Formidable Forms
