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 Tribulant Newsletters allows Reflected XSS. This issue affects Newsletters: from n/a through 4.9.9.6.

Cross-Site Request Forgery (CSRF) vulnerability in Automattic Newspack Newsletters allows Cross Site Request Forgery.This issue affects Newspack Newsletters: from n/a through 2.13.2.

Missing Authorization vulnerability in E-goi Smart Marketing SMS and Newsletters Forms allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Smart Marketing SMS and Newsletters Forms: from n/a through 5.0.9.

Missing Authorization vulnerability in Automattic Newspack Newsletters allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects Newspack Newsletters: from n/a through 2.13.2.

The Newsletters plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's newsletters_video shortcode in all versions up to, and including, 4.9.9.4 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, 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 (XSS or 'Cross-site Scripting') vulnerability in Tribulant Newsletters allows Reflected XSS.This issue affects Newsletters: from n/a through 4.9.9.1.

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.