The document discusses upgrading WooCommerce to address a security vulnerability. It recommends updating to version 2.3.6 immediately after an SQL injection vulnerability was discovered on March 13, 2015. It provides instructions for both automatic and manual upgrades, noting automatic upgrades can be done by clicking "Upgrade Automatically" from the plugin page within WordPress admin. For manual upgrades, the latest version should be downloaded and uploaded to overwrite old files. After any upgrade, permalinks should be saved.