TransUnion Data Breach Impacts 4.4 Million

The credit reporting firm did not name the third-party application involved in the incident, only noting that it was used for its US consumer support operations.

Credit reporting firm TransUnion (NYSE: TRU) is notifying more than 4.4 million people that their personal information was compromised in a data breach.

The incident occurred on July 28, 2025, the company said in data breach notifications sent to the impacted individuals, copies of which were submitted to the Maine and Texas Attorney General’s Offices.

According to TransUnion, the data breach involved personal information stored in a third-party application, including names, Social Security numbers, and dates of birth.

“TransUnion recently experienced a cyber incident that affected a third-party application serving our US consumer support operations. Upon discovery, we quickly contained the issue, which did not involve our core credit database or include credit reports,” the company told SecurityWeek.

“We identified and contained ...