MC2 Data Data Breach

What happened

In August 2024, data aggregator MC2 Data left a database publicly accessible without a password which was subsequently discovered by a security researcher. The breach exposed the personal information of 2.1M subscribers to the service which was marketed under a series of different brand names. The data included email addresses, names and salted SHA-256 password hashes.

Exposed data

Recommended actions

• Change your MC2 Data password immediately, and update it anywhere you reused the same password.
• Enable two-factor authentication on the affected account and on your critical services (email, banking).
• Watch for targeted phishing emails referencing MC2 Data — attackers weaponise breach data quickly.
• Check whether your email address appears in this breach on haveibeenpwned.com.