The Forms for Mailchimp by Optin Cat – Grow Your MailChimp List plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the form color parameters in all versions up to, and including, 2.5.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The MC4WP: Mailchimp Top Bar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 1.6.0. 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 MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 4.9.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'email' parameter when a placeholder such as {email} is used for the field in versions 4.9.9 to 4.9.16 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.

Missing Authorization vulnerability in ibericode MC4WP.This issue affects MC4WP: from n/a through 4.9.9.

Missing Authorization vulnerability in Code Parrots Easy Forms for Mailchimp.This issue affects Easy Forms for Mailchimp: from n/a through 6.9.0.

Insertion of Sensitive Information into Log File vulnerability in Code Parrots Easy Forms for Mailchimp.This issue affects Easy Forms for Mailchimp: from n/a through 6.9.0.

Cross-Site Request Forgery (CSRF) vulnerability in Renzo Johnson Contact Form 7 Extension For Mailchimp.This issue affects Contact Form 7 Extension For Mailchimp: from n/a through 0.5.70.

Cross-Site Request Forgery (CSRF) vulnerability in MailMunch MailChimp Forms by MailMunch.This issue affects MailChimp Forms by MailMunch: from n/a through 3.2.1.

Insertion of Sensitive Information into Log File vulnerability in Paid Memberships Pro Paid Memberships Pro – Mailchimp Add On pmpro-mailchimp.This issue affects Paid Memberships Pro – Mailchimp Add On: from n/a through 2.3.4.