KnownCircle Data Breach (2016): What Was Exposed & What To Do
The KnownCircle Data Breach (2016) (reported April 12, 2016) exposed Email addresses, Email messages, Genders and Names belonging to roughly 2.0M people. If you have an account with them, your information may now be circulating on the open web and with data brokers. Here’s exactly what happened, how to check if you were affected, and what to do next.
What was exposed
- Email addresses
- Email messages
- Genders
- Names
- Passwords
- Phone numbers
- Physical addresses
How to check if you were affected
Run a free exposure scan with your email address. It matches you against known breach datasets and shows where your information has surfaced. Check if you’re exposed →
What to do if you were in the KnownCircle Data Breach (2016)
- Change the password on that account — and anywhere you reused it — then turn on two-factor authentication (2FA).
- Expect targeted phishing that references this breach — be skeptical of unexpected emails asking you to log in, verify, or pay.
- Watch for scam texts and SIM-swap attempts, and avoid using SMS as your only two-factor method where you can.
- Your physical address may be circulating — remove yourself from data-broker and people-search sites to lower your doxxing risk.
- Remove your personal information from data-broker sites so the leaked data can’t be combined against you — GalaxyWarden files those removals for you.
How this breach connects
Frequently asked questions
Was my data in the KnownCircle Data Breach (2016) breach?
The fastest way to know is a free exposure scan — it checks your email address against known breach data, including recent incidents like this one.
What information was exposed in the KnownCircle Data Breach (2016)?
The reported exposed data includes: Email addresses, Email messages, Genders, Names, Passwords, Phone numbers, Physical addresses.
What should I do after the KnownCircle Data Breach (2016) breach?
Change your password for that account and anywhere you reused it, turn on two-factor authentication, and remove your personal information from data-broker sites so it can’t be combined with the leaked data.
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Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.