TransUnion Data Breach History

This page tracks the TransUnion data breach history and cybersecurity incidents affecting TransUnion (United States). BreachHistory currently indexes 6 publicly disclosed or catalogued incidents spanning 2005 through 2025, with approximately 58.5 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The TransUnion breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest TransUnion Data Breaches

The largest indexed incidents include the 2022 TransUnion South Africa — 54M (stolen credentials), the 2025 TransUnion — Salesforce third-party app breach; 4.4M consumers’ SSNs and supp…, and the 2005 — TransUnion: A desktop containing Social Security numbers and…, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by TransUnion or a regulator. Below is the list of large data breaches:

• 2022 2022 TransUnion South Africa — 54M (stolen credentials) — about 54.0M records exposed · Catalogued incident
• 2025 2025 TransUnion — Salesforce third-party app breach; 4.4M consumers’ SSNs and support data — about 4.5M records exposed · Catalogued incident
• 2005 2005 — TransUnion: A desktop containing Social Security numbers and… — about 3.6K records exposed · Catalogued incident
• 2006 2006 — TransUnion: Four different scam companies downloaded the credit… — about 1.7K records exposed · Catalogued incident
• 2012 2012 — TransUnion: An unauthorized access occurred sometime between… — about 461 records exposed · Catalogued incident
• 2008 2008 — TransUnion: Credit profiles of as many as 400 Americans have… — about 400 records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, Social Security numbers and national IDs, phone numbers, names, physical addresses, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

TransUnion Data Breach 2026

At the time of this update, no TransUnion data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a TransUnion data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This TransUnion breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.