US Office of Personnel Management Data Breach History
WebsiteOPM manages the federal workforce and was victim of a major 2015 breach.
This page shows all data breaches of US Office of Personnel Management. View the complete breach timeline, records exposed, root causes, and AI breach risk score. BreachHistory tracks disclosed data breaches worldwide.
Data Breach Timeline — All US Office of Personnel Management Breaches
- 2015 2015 — US Office of Personnel Management: Hacking, 21500000 records 21.5M records Share
- 2015 2015 — US Office of Personnel Management: The intruders, 4.0M records 4.0M records Share
US Office of Personnel Management Data Breach Summary
This page tracks the US Office of Personnel Management data breach history and cybersecurity incidents affecting US Office of Personnel Management (United States). BreachHistory currently indexes 2 publicly disclosed or catalogued incidents spanning 2015, with approximately 25.5 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 US Office of Personnel Management 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 US Office of Personnel Management Data Breaches
The largest indexed incidents include the 2015 — US Office of Personnel Management: Hacking, 21500000 records and the 2015 — US Office of Personnel Management: The intruders, 4.0M records. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by US Office of Personnel Management or a regulator. Below is the list of large data breaches:
- 2015 2015 — US Office of Personnel Management: Hacking, 21500000 records — about 21.5M records exposed · Catalogued incident
- 2015 2015 — US Office of Personnel Management: The intruders, 4.0M records — about 4.0M 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.
US Office of Personnel Management Data Breach 2026
At the time of this update, no US Office of Personnel Management 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 US Office of Personnel Management 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 US Office of Personnel Management 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.