Office of Personnel Management Data Breach History

This page tracks the Office of Personnel Management data breach history and cybersecurity incidents affecting Office of Personnel Management (United States). BreachHistory currently indexes 6 publicly disclosed or catalogued incidents spanning 2010 through 2015, with approximately 68.5 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 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 Office of Personnel Management Data Breaches

The largest indexed incidents include the 2015 — US Office of Personnel Management (2nd Breach): Attackers have targeted the…, the 2015 — US Office of Personnel Management: Hacking, 21500000 records, and the 2010 — US Office of Personnel Management (2nd Breach): attackers have targeted the…, 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 Office of Personnel Management or a regulator. Below is the list of large data breaches:

• 2015 2015 — US Office of Personnel Management (2nd Breach): Attackers have targeted the forms submitte… — about 21.5M records exposed · Catalogued incident
• 2015 2015 — US Office of Personnel Management: Hacking, 21500000 records — about 21.5M records exposed · Catalogued incident
• 2010 2010 — US Office of Personnel Management (2nd Breach): attackers have targeted the forms submitte… — 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 email addresses, names, physical addresses, 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.

Office of Personnel Management Data Breach 2026

At the time of this update, no 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 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 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.