The Contact Form Plugin WordPress plugin before 4.3.25 does not properly sanitize and escape the srcdoc attribute in iframes in it's custom HTML field type, allowing a logged in user with roles as low as contributor to inject arbitrary javascript into a form which will trigger for any visitor to the form or admins previewing or editing the form.
| Software | From | Fixed in |
|---|---|---|
| fluentforms / contact_form | - | 4.3.25 |