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.

Cross-site scripting (XSS) vulnerability in compose.php in OpenNewsletter 2.5 and earlier allows remote attackers to inject arbitrary web script or HTML via the type parameter.

Open Newsletter 2.5 and earlier allows remote authenticated administrators to execute arbitrary PHP code by inserting the code into the email parameter to (1) subscribe.php or (2) unsubscribe.php.

The (1) settings.php and (2) subscribers.php scripts in Open Newsletter 2.5 and earlier do not exit when authentication fails, which allows remote attackers to perform unauthorized administrative actions, or execute arbitrary code in conjunction with another vulnerability.