Hack of Ernst & Young's external support system exposes client tax data
Ernst & Young's external IT support ticketing platform was hacked, exposing clients' personal information including tax and financial data and Social Security numbers. Ernst & Young disclosed the breach and launched an investigation, and a class action was later filed. ShinyHunters claimed responsibility for the attack and threatened to publish the stolen data.
Key facts
- Affected organisation
- Ernst & Young
- Incident type
- Data breach
- Occurred / detected
- Not confirmed
- Scale of damage
- Client personal information including tax and financial data and Social Security numbers
- Cause / method
- Hack of an external IT support ticketing platform
- Location
- United States
If your data was exposed
Exposed dataNational ID number
Timeline
- Ernst & Young disclosed a data breach caused by a hack of an external support system and launched an investigation.
- It came to light that the exposed information included Social Security numbers.
- A class action was filed against Ernst & Young over the data breach.
- ShinyHunters claimed responsibility for the Ernst & Young data breach.
- ShinyHunters threatened to publish the stolen data on 31 July.
Also affected by this incident
Goldman Sachs Group clients hit by Ernst & Young data breach
↳ Knock-on damage from the Ernst & Young incident · View original incidentGoldman Sachs Group and its clients were affected by the Ernst & Young data breach that occurred in early 2026. The specific scale of the damage, the types of information leaked and the response measures have not been confirmed.
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- Ernst & Young discloses data breach after support system hack
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- Ernst & Young Data Breach Exposes Social Security Numberes
- Ernst & Young Data Breach Analysis: Third-Party IT Support Platform Compromise Exposes Client Tax and Financial Information
- [주의] 회계법인 EY, 제3자 IT 지원시스템 해킹으로 고객 세금·금융정보 담긴 문서 유출
- EY reports data breach on IT support ticket platform: Trial Balance
- Ernst & Young Data Breach Affects Personal, Financial Information
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- EY hit with proposed class action over data breach
- Ernst & Young data breach claimed by ShinyHunters extortion gang
- ShinyHunters Claims Ernst & Young (EY) Data Breach, Threatens July 31 Leak
- ShinyHunters Claims Ernst & Young Data Breach, Threatens to Leak Stolen Data
- ShinyHunters Claims Ernst & Young Hack
- ShinyHunters targets accounting giant EY aka Ernst & Young leading to Data Breach
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- ShinyHunters claims EY cyberattack and threatens client data leak
- Ernst & Young 2026 Data Breach Analysis: Third-Party IT Support Platform Compromise Exposes Sensitive Client Information
- Ernst & Young (EY) Data Breach Exposes Financial Clients’ Information Including Goldman Sachs
- ASOS Data Breach 2026: Cybersecurity Incident Analysis of Third-Party Compromise and Social Engineering Attack
Other incidents at Ernst & Young
Ernst & Young cloud migration error exposes 4TB backup
Impact: Database of about 4TB containing company secrets
A cloud migration error at Ernst & Young left a database of about 4TB publicly exposed online. The exposed data was a SQL Server backup stored on Microsoft Azure and contained company secrets.
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The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.