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Confirmed

Mercadien: files accessed via exploited vulnerability, affecting client data

Exploitation of a security vulnerability let an unauthorised third party access Mercadien files from about September 17, 2025, including data received from clients such as credit unions.

Last updated: 2026-11-09

Overview

Detected November 7, 2025. Several clients (Suffolk FCU, Fairwinds CU, Bangkok Bank New York branch) notified separately; disclosedOn is the earliest verified regulator posting (Suffolk FCU, September 11, 2026). No total is given.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Verify notices through official channels, avoid links in unexpected messages, do not provide credentials, and review credit reports and statements.

Sources

  1. Sample consumer notice filed with California AG (Mercadien, P.C. CPAs)California Department of Justice, Office of the Attorney General · 2026-11-09
  2. Sample consumer notice filed with California AG (Suffolk Federal Credit Union, Mercadien incident)California Department of Justice, Office of the Attorney General · 2026-11-09
  3. California AG data breach report: Mercadien, P.C. CPAsCalifornia Department of Justice, Office of the Attorney General · 2026-11-09

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