CVE-2026-18391
UnknownSummary
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.
Risk Assessment
An unauthenticated attacker can execute arbitrary code on the server, potentially leading to full site takeover, data theft, or malware installation.
Recommendation
Update the WooCommerce Subscriptions plugin to version 9.1.0 or later. If updating is not possible, consider disabling High-Performance Order Storage.
Original NVD description (English source)
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.