Carefirst Data Breach History

This page tracks the Carefirst data breach history and cybersecurity incidents affecting Carefirst. BreachHistory currently indexes 3 publicly disclosed or catalogued incidents spanning 2014 through 2015, with approximately 2.2 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 Carefirst 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 Carefirst Data Breaches

The largest indexed incidents include the 2015 — Carefirst: The largest insurer in the Baltimore regions,…, the 2015 — Carefirst: Attacked happened in June 2014, 1.1M records, and the 2014 — Carefirst: info inadvertently mailed Location of breached…. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Carefirst or a regulator. Below is the list of large data breaches:

• 2015 2015 — Carefirst: The largest insurer in the Baltimore regions,… — about 1.1M records exposed · Catalogued incident
• 2015 2015 — Carefirst: Attacked happened in June 2014, 1.1M records — about 1.1M records exposed · Catalogued incident
• 2014 2014 — Carefirst: info inadvertently mailed Location of breached… — about 2 records exposed · Catalogued incident

What Information Was Exposed?

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

Carefirst Data Breach 2026

At the time of this update, no Carefirst 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 Carefirst 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 Carefirst 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.