The Simple Signup Form plugin for WordPress is vulnerable to SQL Injection via the 'id' attribute of the 'ssf' shortcode in all versions up to, and including, 1.6.5 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with Contributor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The SimpleForm – Contact form made simple plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg & remove_query_arg without appropriate escaping on the URL in all versions up to, and including, 2.2.0. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

The Simple Basic Contact Form plugin for WordPress for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 20240502. This allows unauthenticated attackers to execute arbitrary shortcodes. The severity and exploitability depends on the functionality of other plugins installed in the environment.

The Simple Basic Contact Form plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘scf_email’ parameter in versions up to, and including, 20221201 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Laurence/OhMyBox.Info Simple Long Form allows Stored XSS.This issue affects Simple Long Form: from n/a through 2.2.2.

The Simple Basic Contact Form WordPress plugin before 20221201 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

The Very Simple Contact Form WordPress plugin before 11.6 exposes the solution to the captcha in the rendered contact form, both as hidden input fields and as plain text in the page, making it very easy for bots to bypass the captcha check, rendering the page a likely target for spam bots.

Plataformatec Simple Form has Incorrect Access Control in file_method? in lib/simple_form/form_builder.rb, because a user-supplied string is invoked as a method call.

CMS Made Simple version 1.x Form Builder before version 0.8.1.6 allows remote attackers to execute PHP code via the cntnt01fbrp_forma_form_template parameter in admin_store_form.