There was a flaw in the WordPress plugin, Email Subscribers & Newsletters before 4.3.1, that allowed SQL statements to be passed to the database in the hash parameter (a blind SQL injection vulnerability).

The Subscribe2 – Form, Email Subscribers & Newsletters plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ip parameter in all versions up to, and including, 10.43 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in SendPulse SendPulse Email Marketing Newsletter allows Stored XSS. This issue affects SendPulse Email Marketing Newsletter: from n/a through 2.1.5.

The WordPress Email Newsletter WordPress plugin through 1.1 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.

Missing Authorization vulnerability in blossomthemes BlossomThemes Email Newsletter allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects BlossomThemes Email Newsletter: from n/a through 2.2.4.

The Recover WooCommerce Cart Abandonment, Newsletter, Email Marketing, Marketing Automation By FunnelKit WordPress plugin before 3.3.0 does not sanitize and escape the bwfan-track-id parameter before using it in a SQL statement, allowing unauthenticated users to perform SQL injection attacks

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 Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.1.87. This is due to missing or incorrect nonce validation on the Init() function. This makes it possible for unauthenticated attackers to log out of a Brevo connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The Email Subscribers by Icegram Express – Email Marketing, Newsletters, Automation for WordPress & WooCommerce plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 5.7.34. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for authenticated attackers, with Subscriber-level access and above, to execute arbitrary shortcodes.

The Email Subscribers by Icegram Express – Email Marketing, Newsletters, Automation for WordPress & WooCommerce plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the 'preview_email_template_design' function in all versions up to, and including, 5.7.34. This makes it possible for authenticated attackers, with Subscriber-level access and above, to extract sensitive data including the content of private, password protected, pending, and draft posts and pages.