Western Alliance Bank

1 breach22K affected in allFinancewesternalliancebank.com

Cleo zero-day breach exposes 21,899 Western Alliance Bank customersSupply chain exposed names, Social Security numbers, financial details, dates of birth and government IDs. Reported to the California AG.Supply chain22K affectedFinanceUSMar 14, 2025

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campaign2026-09-25

Western Alliance Bank, 2025-03-14cleo-2024

attack2026-09-25

Western Alliance Bank, 2025-03-14supply-chain

data_types2026-09-25

Western Alliance Bank, 2025-03-14["names","ssn","financial","dob","government-id"]

records_basis2026-09-25

Western Alliance Bank, 2025-03-14organization

records2026-09-25

Western Alliance Bank, 2025-03-1421899

summary2026-09-25

Western Alliance Bank, 2025-03-14Western Alliance Bank said attackers exploited a zero-day in a vendor's file transfer software (Cleo) to take files between October 12 and 24, 2024, and notified 21,899 customers.

title2026-09-25

Western Alliance Bank, 2025-03-14Cleo zero-day breach exposes 21,899 Western Alliance Bank customers

domain2026-09-25

Western Alliance Bankwesternalliancebank.com

attack2026-09-25

Western Alliance Bank, 2025-03-14ransomware

discovered2026-09-25

Western Alliance Bank, 2025-03-142025-01-27

Added2026-09-25

Western Alliance Bank, 2025-03-14

Added2026-09-25

Western Alliance Bank