Insecure Deserialization in the Newsletter plugin before 6.8.2 for WordPress allows authenticated remote attackers with minimal privileges (such as subscribers) to use the tpnc_render AJAX action to inject arbitrary PHP objects via the options[inline_edits] parameter. NOTE: exploitability depends on PHP objects that might be present with certain other plugins or themes.

Missing Authentication for Critical Function in Icegram Email Subscribers & Newsletters Plugin for WordPress prior to version 4.5.6 allows a remote, unauthenticated attacker to conduct unauthenticated email forgery/spoofing.

Cross-site request forgery in Icegram Email Subscribers & Newsletters Plugin for WordPress v4.4.8 allows a remote attacker to send forged emails by tricking legitimate users into clicking a crafted link.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in Icegram Email Subscribers & Newsletters Plugin for WordPress v4.4.8 allows a remote, authenticated attacker to determine the value of database fields.

SQL Injection exists in Advanced Newsletter Magento extension before 2.3.5 via the /store/advancednewsletter/index/subscribeajax/an_category_id/ PATH_INFO.

The WordPress plugin, Email Subscribers & Newsletters, before 4.2.3 had a flaw that allowed for CSRF to be exploited on all plugin settings.

The WordPress plugin, Email Subscribers & Newsletters, before 4.2.3 had a flaw that allowed for unauthenticated option creation. In order to exploit this vulnerability, an attacker would need to send a /wp-admin/admin-post.php?es_skip=1&option_name= request.

The WordPress plugin, Email Subscribers & Newsletters, before 4.2.3 had a flaw that allowed users with edit_post capabilities to manage plugin settings and email campaigns.

The WordPress plugin, Email Subscribers & Newsletters, before 4.2.3 had a privilege bypass flaw that allowed authenticated users (Subscriber or greater access) to send test emails from the administrative dashboard on behalf of an administrator. This occurs because the plugin registers a wp_ajax function to send_test_email.

An issue was discovered in the MailPoet Newsletters (aka wysija-newsletters) plugin before 2.8.2 for WordPress. The plugin is vulnerable to SPAM attacks.