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third-party risk news

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Ernst & Young Data Breach Linked to Compromised Third-Party Support System

Ernst & Young (EY), one of the "Big Four" professional services firms, has disclosed a data breach stemming from the compromise of a third-party IT support system. The incident, which EY detected on April 23, 2026, involved unauthorized access to a platform used by its IT teams to manage support requests for tax-related work.

data breach

Ernst & Young Reports Data Breach After Support System Hack

Ernst & Young (EY) has begun notifying clients of a data breach stemming from unauthorized access to a third-party support ticket system utilized by its IT department. The professional services giant, one of the world's largest, discovered unusual activity on its networks on April 23 and launched an investigation with external cybersecurity specialists.