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.

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.

Cross-site scripting (XSS) vulnerability in the Contact Form Clean and Simple (clean-and-simple-contact-form-by-meg-nicholas) plugin 4.4.0 and earlier for WordPress allows remote attackers to inject arbitrary web script or HTML via the cscf[name] parameter to contact-us/.

PHP remote file inclusion vulnerability in contact/contact.php in Groone's Simple Contact Form allows remote attackers to execute arbitrary PHP code via a URL in the abspath parameter.