Ernst & Young (EY) Investigates Data Breach Involving Third-Party Support Tickets

Ernst & Young (EY) is disclosed a data breach linked to a compromised third-party support ticket system used by its IT teams. The platform stored support requests that may have included documents containing client tax information.

“EY uses a third-party information technology service management platform to help EY information technology personnel provide support to EY teams performing tax-related work for clients. Support tickets submitted through the platform may include documents containing client tax information. On April 23, 2026, EY identified anomalous activity within that platform.” reads the data breach notification. ” “EY’s Information Security team immediately initiated its incident response procedure to determine the nature and scope of the incident, contain it, and begin remediation and recovery efforts. EY has worked with an independent cybersecurity firm to investigate the incident and confirm that the unauthorized access has been stopped, and our systems are now secure. Based on EY’s investigation and available evidence, between March 28, 2026, and April 12, 2026, an unauthorized third party accessed the platform referenced above and downloaded documents pertaining to a number of EY clients.”