Black & White Path

Jul 18, 2026 · Industry Insights

When the World's Leading Auditor Gets Hacked: EY’s Client Tax Files Stolen

EY, one of the Big Four audit firms, disclosed that a hacker infiltrated its third‑party IT support ticket platform from March 28 to April 12 2026, exfiltrating client tax documents, yet the breach was not reported to affected customers until July 13, highlighting supply‑chain risks, delayed transparency, and the limits of even top‑tier security teams.