DisclosureLens
HackingFinancial ServicesFinanceVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedFinancial accountIdentity (basic)Government IDPIIMediumContained

Western Alliance Bank

bd_1e2bedd75bd91a03 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 27, 2025

Filed

Jun 30, 2025

To disclose

22 weeks

Affected

539state residents only

Linked

12 records

Confidence

69%
Full breach record for Western Alliance Bank →

Western Alliance Bank disclosed a cyberattack involving a third-party vendor's secure file transfer software. An unauthorized actor exploited an unknown vulnerability to access systems and exfiltrate files between Oct 12-24, 2024. The bank discovered the incident on Jan 27, 2025, and confirmed personal information (names, addresses) was involved on June 3, 2025. 539 Washington residents were notified. Law enforcement was notified, and credit monitoring was offered.

Washington clock✗ WA AG >90d22 weeks discovery → filing
⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 107 days
discovery → filing · 22 weeks / 154 days

Oct 12, 2024

Begins

Jan 27, 2025

Discovered

Jun 30, 2025

Filed

vs. sector median

+14 wks slower

This filing is one of 12 records about the same incident.View merged incident
A leak claim by cl0p about this victim was first seen 157 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Show 6 more filings ↓up to 108d gap

Showing first 10 of 11 linked disclosures.

Filing propagation · 11 filings · 10 states

View merged incident ↗
California State AGMar 14 · first
Nebraska State AGMar 14 · first
Maryland State AGMar 14 · first
Montana State AGMar 14 · first
Massachusetts State AGMar 14 · first
Maine State AGMar 14 · first
New Hampshire State AGMar 14 · first
Oregon State AG+108d
New Hampshire State AG+108d
Washington State AG+108d · this page
Texas State AG+109d

Pattern: first filing Mar 14 (CA), last Jul 1 (TX) — a 109-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.