securityaffairs.com 7/29/2026, 2:42:05 PM · external

ShinyHunters threatens to leak EY tax data by July 31

ShinyHunters threatens to leak EY tax data by July 31
Developing story breach 3 articles tracked
Ernst & Young data breach via third‑party ticket system
CyberSIXT Evidence Panel
Primary Source oag.ca.gov
Threat Actor

THE cybercrime group ShinyHunters has claimed responsibility for a data breach at Ernst & Young (EY), threatening to leak sensitive tax records unless the firm engages with them by July 31. The breach involved unauthorized access to a third-party service management platform, compromising personal and financial information of clients, such as names, Social Security numbers, and bank details.

EY has acknowledged the breach, stating that it occurred between March 28 and April 12 and that it is offering affected individuals 24 months of complimentary credit monitoring services. Meanwhile, ShinyHunters has gained notoriety for targeting high-profile organizations and using data theft as leverage for ransom.

View Primary Source Via securityaffairs.com

Article by CyberSIXT

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