M&S shoppers are being urged to enhance their online security following a cyber attack that disrupted customer services. The retailer has acknowledged ongoing challenges, stating they cannot process online orders while stores remain open. Sensitive customer information, including phone numbers, email addresses, and order histories, was compromised in the breach. Security expert Luis Corrons from Norton recommends activating two-step verification for online accounts, being cautious about stored personal and payment information, deleting unused accounts, using strong passwords, and keeping devices and software updated to improve security. He emphasizes that cyber threats are increasingly targeting human behavior and that these security measures are essential for digital safety.