MC2 Data data breach: 2.1M accounts exposed
Severity: high · Patch status: no-fix-needed · Since 2024-12-15
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: email addresses, names, passwords. The breach dates from Aug 18, 2024; Have I Been Pwned loaded it on Dec 15, 2024.
What to do
- If you had a MC2 Data account, change its password and the password of any other account that reused it.
- Turn on multi-factor authentication wherever it is offered.
- Check whether your addresses are in this breach at https://haveibeenpwned.com.
- Expect targeted phishing that quotes the leaked details; verify any unexpected contact out of band.
Sources
All live incidents on Threat Watch