Currently, WooCommerce team started to send a message related to Critical Vulnerability Detected in WooCommerce to all the sites owners that have WooCommerce Plugin is using. There is no need to worry about all of the site owners we just need to update the site with the latest version of the WooCommerce Plugin. This vulnerability affected WooCommerce versions 3.3 to 5.5. So developers / site owners need to update the site with WooCommerce latest version 5.5.1.
If you are also using the WooCommerce Blocks Plugin on your Website then please also update this plugin with the latest version 5.5.1
For a more secure site please make all your Plugin up to date. If not then maybe WooCommerce team trying to raise issues in the near future.