The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to unauthorized plugin setting changes due to a missing capability check on the toggleRolesAndPermissions and editAllowedRolesAndPermissions functions in all versions up to, and including, 1.7.6. This makes it possible for unauthenticated attackers to allow lower level users to modify forms.

The MailerLite – Signup forms (official) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in versions 1.5.0 to 1.7.6 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Cross-Site Request Forgery (CSRF) vulnerability in MailerLite MailerLite – WooCommerce integration.This issue affects MailerLite – WooCommerce integration: from n/a through 2.0.8.

SuperWebMailer v9.31.0.01799 was discovered to contain a reflected cross-site scripting (XSS) vulenrability via the component api.php.

The POST SMTP Mailer WordPress plugin before 2.8.7 does not properly sanitise and escape several parameters before using them in SQL statements, leading to a SQL injection exploitable by high privilege users such as admin.

Improper input validation vulnerability in Newsletter Software SuperMailer affecting version 11.20.0.2204. An attacker could exploit this vulnerability by sending a malicious configuration file (file with SMB extension) to a user via a link or email attachment and persuade the user to open the file with the affected software on the local system. A successful exploit could allow the attacker to crash the application when attempting to load the malicious file.

The POST SMTP Mailer WordPress plugin before 2.7.1 does not escape email message content before displaying it in the backend, allowing an unauthenticated attacker to perform XSS attacks against highly privileged users.

An issue was discovered in SuperWebMailer 9.00.0.01710. It allows keepalive.php XSS via a GET parameter.

An issue was discovered in SuperWebMailer 9.00.0.01710. It allows Remote Code Execution via a crafted sendmail command line.

An issue was discovered in SuperWebMailer 9.00.0.01710. It allows superadmincreate.php XSS via crafted incorrect passwords.