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PwC Confirms Data Breach by Everest Hacking Group

First seen 23 Oct 2026, 17:14 UTC • •

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ThreatCluster AI
ThreatCluster •October 23, 2026 at 18:15 UTC
  • •PwC confirmed a data breach involving a third-party vendor.
  • •The Everest hacking group claims to have stolen 590 GB of employee data.
  • •Affected data includes HR records, training documents, and internal audit methodologies.

PwC reported a cybersecurity incident involving a third-party vendor that hosts employee learning records. The Everest hacking group claimed to have stolen approximately 590 gigabytes of data, including employee information and internal documents. The breach affects multiple PwC regional operations, including Australia, China, Canada, and the UK. PwC stated that the affected site does not contain client data or sensitive personal information. They have initiated a review and secured the environment following the incident. Everest has threatened to release the stolen data unless a deal is reached within five days. The incident was publicly acknowledged on October 22, 2026, when Everest made its claims known. PwC has not confirmed the specifics of the data stolen or the validity of Everest's claims.

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Timeline

2026-10-22
Everest claims responsibility for breach
The Everest hacking group announced on its website that it stole 590 GB of data from PwC, including employee records and internal documents.
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2026-10-23
PwC confirms cybersecurity incident
PwC acknowledged the cybersecurity incident and stated that the affected site does not house client data or sensitive personal information.
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Common questions

What type of data was stolen?
The stolen data reportedly includes employee information, training records, and internal documents.
Is client data affected?
No, PwC confirmed that the affected site does not house client data or sensitive personal information.
What actions is PwC taking?
PwC has secured the environment and is conducting a thorough review of the incident.