TransUnion data breach class action overview:
- Who: Plaintiff Crystal Sevigny filed a TransUnion class action lawsuit against TransUnion LLC.
- Why: Sevigny alleges TransUnion failed to properly secure and safeguard the personally identifiable information (PII) and financial information of more than 4.4 million individuals.
- Where: The TransUnion data breach class action lawsuit was filed in Illinois federal court.
A new class action lawsuit accuses TransUnion of failing to properly secure and safeguard the personally identifiable information and financial information of more than 4 million individuals in a data breach.
Plaintiff Crystal Sevigny filed the class action lawsuit against TransUnion LLC on Sept. 8 in Illinois federal court, alleging violations of state and federal consumer laws.
According to the lawsuit, the breach was discovered July 28, 2025, and involved unauthorized third-party cybercriminals accessing and potentially misusing the personal data of TransUnion’s customers.
The TransUnion data breach allegedly exposed sensitive information, including names, dates of birth and Social Security numbers, of more than 4.4 million people.
Sevigny, a Colorado resident, alleges that she was a victim of identity theft as a result of the breach. She claims her credit report now reflects fraudulent debts totaling more than $30,000, and multiple unauthorized credit inquiries have been made into her credit file.
Security measures inadequate, TransUnion class action lawsuit claims
TransUnion sent out a notice of the breach on Aug. 27, 2025, but Sevigny argues that the credit reporting agency failed to take adequate measures to protect the compromised data, despite being aware of the risks involved in storing sensitive personal and financial information.
The class action lawsuit alleges that TransUnion neglected to take reasonable measures to ensure the security of its data, including failing to encrypt data and failing to follow required protocols and procedures.
As a result, Sevigny argues that the TransUnion data breach has left her and other class members vulnerable to future identity theft and fraud.
The class action lawsuit seeks to represent all individuals in the United States whose personal and financial information was exposed in the TransUnion data breach. Sevigny is seeking damages and injunctive relief, including measures to ensure that TransUnion improves its data security practices.
If your credit was damaged by fraud or identity theft, or you have errors on your credit report from within the last two years, see if you qualify for a free claim review.
What do you think of the allegations made in this TransUnion class action lawsuit? Let us know in the comments.
Sevigny is represented by Kevin Laukaitis of Laukaitis Law LLC.
The TransUnion data breach class action lawsuit is Crystal Sevigny v. TransUnion LLC, Case No. 1:25-cv-10759, in the U.S. District Court for the Northern District of Illinois.
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