Biggest Data Breaches in Retail (Updated August 2026) | UpGuard

This report reviews the history and 2024–2026 landscape of major retail data breaches and campaigns — covering POS malware, Magecart web skimming, cloud-tenant intrusions (the Snowflake campaign), and social-engineering incidents (Scattered Spider) — ranks the largest incidents by records or notability, outlines regulatory and compliance changes (notably PCI DSS 4.0.1 and e‑commerce requirements), and recommends controls and vendor/identity monitoring with UpGuard's platform as an example mitigation approach.