Automatic Data Processing Data Breach History

This page tracks the Automatic Data Processing data breach history and cybersecurity incidents affecting Automatic Data Processing (United States). BreachHistory currently indexes 7 publicly disclosed or catalogued incidents spanning 2005 through 2016, with approximately 631 thousand 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 Automatic Data Processing 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, while 1 remain unverified claims pending independent verification.

Largest Automatic Data Processing Data Breaches

The largest indexed incidents include the 2010 — Automatic Data Processing: Poor security, 125K records, the 2006 Automatic Data Processing — data breach (125,000+ records), and the 2006 — Automatic Data Processing: Automatic Data Processing, one of the world's…, 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 Automatic Data Processing or a regulator. Below is the list of large data breaches:

• 2010 2010 — Automatic Data Processing: Poor security, 125K records — about 125.0K records exposed · Catalogued incident
• 2006 2006 Automatic Data Processing — data breach (125,000+ records) — about 125.0K records exposed · Catalogued incident
• 2006 2006 — Automatic Data Processing: Automatic Data Processing, one of the world's… — about 125.0K records exposed · Catalogued incident
• 2005 2005 — Automatic Data Processing: Poor security / misconfiguration, 125000 records — about 125.0K records exposed · Catalogued incident
• 2005 2005 — Automatic Data Processing: Business outsourcing, payrolls, benefits, 125K records — about 125.0K records exposed · Catalogued incident
• 2013 2013 — Automatic Data Processing: A software code error caused W-2 information to be… — about 6.3K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include health and medical (PHI) records, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Automatic Data Processing Data Breach 2026

At the time of this update, no Automatic Data Processing 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 Automatic Data Processing 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 Automatic Data Processing 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.