The ConvertKit WordPress plugin before 2.0.5 does not validate and escapes some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as a contributor to perform Stored Cross-Site Scripting attacks, which could be used against high-privilege users such as admins.

An issue was discovered in the fp_newsletter (aka Newsletter subscriber management) extension before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6 for TYPO3. Data about subscribers may be obtained via unsubscribeAction operations.

An issue was discovered in the fp_newsletter (aka Newsletter subscriber management) extension before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6 for TYPO3. Data about subscribers may be obtained via createAction operations.

An issue was discovered in the fp_newsletter (aka Newsletter subscriber management) extension before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6 for TYPO3. Attackers can unsubscribe everyone via a series of modified subscription UIDs in deleteAction operations.

An issue was discovered in the fp_newsletter (aka Newsletter subscriber management) extension before 1.1.1, 1.2.0, 2.x before 2.1.2, 2.2.1 through 2.4.0, and 3.x before 3.2.6 for TYPO3. There is a CAPTCHA bypass that can lead to subscribing many people.

The Icegram Express WordPress plugin before 5.5.1 does not properly sanitise and escape a parameter before using it in a SQL statement, leading to a SQL injection exploitable by any authenticated users, such as subscriber

OpenCart 3.x Newsletter Custom Popup was discovered to contain a SQL injection vulnerability via the email parameter at index.php?route=extension/module/so_newletter_custom_popup/newsletter.

Newsletter Module v3.x was discovered to contain a SQL injection vulnerability via the zemez_newsletter_email parameter at /index.php.

The Newsletter WordPress plugin before 7.4.6 does not escape and sanitise the preheader_text setting, which could allow high privilege users to perform Stored Cross-Site Scripting attacks when the unfilteredhtml is disallowed

The Newsletter WordPress plugin before 7.4.5 does not sanitize and escape the $_SERVER['REQUEST_URI'] before echoing it back in admin pages. Although this uses addslashes, and most modern browsers automatically URLEncode requests, this is still vulnerable to Reflected XSS in older browsers such as Internet Explorer 9 or below.