The ShinyHunters ransomware group listed Mytheresa on its data leak site on 2026-04-12. Country: DE Sector: Retail & E-Commerce Claim as published on the leak site: Sensitive customer PII data and transactional history data was compromised. Pay or leak. This is a final warning to reach out by 14 Apr 2026 before we leak along with several annoying (digital) problems that'll come your way. Make the right decision, don't be the next headline. | Updated: 11 Apr 2026 | Warning: FINAL WARNING PAY OR LEAK