9.8
Critical
CVE-2026-18391 The WooCommerce Subscriptions WordPress plugin before 9.1.0 does not validate user input before unserializing it on…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| WooCommerce Subscriptions 4.7 | 4.7.0 → < 9.1.0 | 9.1.0 |