CVE-2026-18391 [CRITICAL] – The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input b

The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before unserializing it on stores with High-Performance Order Storage enabled, leading to a PHP Object Injection issue which unauthenticated users can escalate to Remote Code Execution via a gadget chain present in the bundled dependencies.