Telefónica data breach: HellCat leaks 106 GB of internal files
Overview Between July 4–7, 2025, a hacker associated with the HellCat ransomware gang leaked over 106 GB of internal Telefónica data, escalating an ongoing extortion campaign. Background Telefónica, one of Europe’s largest telecom providers, has previously suffered attacks. This latest breach exposed sensitive internal documents, customer data, and operational details. What Happened Hackers infiltrated systems via a known…