The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

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 Check & Log Email plugin for WordPress is vulnerable to Unauthenticated Hook Injection in all versions up to, and including, 1.0.9 via the check_nonce function. This makes it possible for unauthenticated attackers to execute actions with hooks in WordPress under certain circumstances. The action the attacker wishes to execute needs to have a nonce check, and the nonce needs to be known to the attacker. Furthermore, the absence of a capability check is a requirement.

ReDos in NPMJS Node Email Check v.1.0.4 allows an attacker to cause a denial of service via a crafted string to the scpSyntax component.

The Check & Log Email WordPress plugin before 1.0.6 does not sanitise and escape a parameter before outputting it back in an attribute in an admin page, leading to a Reflected Cross-Site Scripting

The Check & Log Email WordPress plugin before 1.0.4 does not escape the d parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting

The Check & Log Email WordPress plugin before 1.0.3 does not validate and escape the "order" and "orderby" GET parameters before using them in a SQL statement when viewing logs, leading to SQL injections issues

The check-email plugin before 0.5.2 for WordPress has XSS.