CVE-2026-12583

The Newsletters WordPress plugin versions prior to 4.15 is vulnerable to an unauthenticated PHP object injection due to the insecure deserialization of untrusted input received through a public form. An attacker can exploit this by injecting a PHP object and leveraging a property-oriented gadget ...

CVE-2026-12583 Newsletters < 4.15 - Unauthenticated PHP Object Injection via Subscriber Custom Field

The Newsletters WordPress plugin before 4.15 does not prevent deserialization of untrusted input that is stored through a public form, allowing unauthenticated attackers to inject a PHP object and, via a property-oriented gadget chain bundled with the Newsletters WordPress plugin before 4.15, wri...