EY Confirms Data Breach Exposing Goldman Sachs and Man Group Client Details via Checkmarx Vulnerability
EY has confirmed a significant data breach in which client documents were accessed and downloaded by an unauthorized party. The files originated from a technology services management platform contracted by EY to support its tax operations division.
The affected clients include individuals from the wealth management division of Goldman Sachs and entities connected to the Man Group, a listed investment fund based in the United Kingdom. Both organizations confirmed that their own systems remained uncompromised, with the exposure occurring exclusively through the EY side.
The leaked materials consisted of attachments from support tickets rather than data from the primary system. This incident highlights how auxiliary support channels can accumulate sensitive client information without receiving equivalent security treatment. Exposed details include names, addresses, tax identification numbers, email addresses, and financial information, enabling the construction of complete personal profiles.
Unauthorized access was achieved through a vulnerability in the Checkmarx software. The intrusion persisted from March 28 to April 12, with suspicious activity detected only on April 23. EY has since engaged independent security firms to assess its systems, notified regulators in California, Texas, Massachusetts, and Vermont, and offered credit monitoring services to impacted individuals.
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