CVE-2026-12583

Summary: The Newsletters WordPress plugin before 4.15 is vulnerable to unauthenticated PHP object injection via a subscriber custom field. Deserialization of untrusted input stored through a public form enables an attacker to write arbitrary files and execute code on the server via a gadget chain...

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...