Ernst & Young (EY) has confirmed suffering a cyberattack in which it lost sensitive customer information, including tax data.
In a data breach notification letter sent to affected individuals, the firm said that on April 23, 2026, it spotted “anomalous activity” within a third-party platform its IT team uses. This is an IT service management platform that helps EY staff support the teams that perform tax-related work for clients. Therefore, the tickets submitted through this platform sometimes also contain documents with client tax information which may have been exposed in the incident.
EY then activated its incident response protocols, bringing in third-party cybersecurity experts, as well as notifying relevant authorities and affected clients.
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Source: Tech Radar
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