KD Coming Soon <= 1.7 is vulnerable to PHP Object Injection vulnerability

The KD Coming Soon plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.7 via deserialization of untrusted input cetitle in the vulnerable kd_cemailer function. This makes it possible for unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.