Nium Data Breach

Nium, Inc., a global payments and financial technology company, recently experienced a serious data breach involving personal data from old internal system files. Though the breach was limited in scope, the type of information exposed could have long-term implications for victims.

Nium Data Breach Investigation

On November 3, 2025, Nium detected unauthorized access to one of its file systems. The incident involved the download of specific internal files, triggering immediate containment measures by the company’s cybersecurity team. Nium quickly blocked the unauthorized access, began a comprehensive investigation, and initiated a review of the compromised files.

What the investigation uncovered was alarming: while the breached file system was primarily used for technical system logs, not personal data—an old file dating back to 2022 contained sensitive personal information. This data belonged to a subset of customers and included names, Social Security numbers, contact information, and birth dates.

In response, Nium conducted a full dependency check across related systems, reset affected accounts, and applied new security controls. They also strengthened internal monitoring tools to catch similar threats in the future. Nium plans to transition to a more secure technology stack to better protect customer data going forward.

Though there is currently no evidence that any of the stolen information has been misused, the data accessed could be exploited for phishing, identity theft, or impersonation scams. The company has urged affected individuals to stay vigilant and is offering free credit monitoring upon request.

When Did This Breach Occur?

The breach occurred on November 3, 2025, and was detected and contained on the same day.

What Information Was Breached?

The compromised 2022 file contained the following information:

• Full name

• Email address

• Physical address

• Phone number

• Social Security number

• Date of birth

What You Can Do

If you were notified by Nium about this incident, take the following steps right away:

• Request credit monitoring by contacting help@instarem.com to enroll in the complimentary service.

• Monitor your credit reports and bank accounts for unusual activity.

• Place a fraud alert or credit freeze on your credit file to prevent new unauthorized accounts.

• Watch for phishing attempts, especially messages pretending to be from banks or companies you trust.

• Stay alert to impersonation scams, where attackers may use your information to pretend to be you.

You deserve answers—and support—after your data is mishandled. Class Action U helps individuals like you take back control by understanding your legal options and holding companies accountable.

File a Data Breach Lawsuit Against Nium

If your data was compromised in this incident, you may be eligible to join a class action lawsuit against Nium. Companies are legally responsible for safeguarding customer information, especially highly sensitive data like Social Security numbers and birth dates. When that duty is breached, consumers may have a right to seek compensation for potential harm or future risks.

Whether or not you’ve experienced fraud yet, it’s critical to act now. Legal recourse can provide financial relief and help prevent future negligence by encouraging stricter data protection standards.

Contact us at Class Action U, where we’ll connect you with a lawyer skilled in class action lawsuits. If you’ve been contacted about this breach, received notice, or discovered you were impacted, fill out our quick, easy, and secure form to sign up. There is no cost to reach out to our legal partner and no obligation after speaking with someone from our team.