Not Acxiom
MEDIUM RISKData breach — June 2020
In 2020, a corpus of data containing almost a quarter of a billion records spanning over 400 different fields was misattributed to database marketing company Acxiom and subsequently circulated within the hacking community. On review, Acxiom concluded that "the claims are indeed false and that the data, which has been readily available across multiple environments, does not come from Acxiom and is in no way the subject of an Acxiom breach". The data contained almost 52M unique email addresses.
search Check if you were affected — freeData exposed in this breach
What happened in the Not Acxiom data breach?
In 2020, a corpus of data containing almost a quarter of a billion records spanning over 400 different fields was misattributed to database marketing company Acxiom and subsequently circulated within the hacking community. On review, Acxiom concluded that "the claims are indeed false and that the data, which has been readily available across multiple environments, does not come from Acxiom and is in no way the subject of an Acxiom breach". The data contained almost 52M unique email addresses.
The exposed data included 5 types of personal information. Learn more about what a data breach means for you.
Quick answer — was Not Acxiom hacked?
Yes. Not Acxiom was breached in June 2020. The breach exposed 51,730,831 records including email addresses, ip addresses, names. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the Not Acxiom breach so dangerous?
The Not Acxiom breach exposed 51,730,831 records — that is 51.7M people whose personal data is now circulating on the dark web. The combination of email addresses, ip addresses, names makes this a medium-risk breach that should be addressed promptly.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the Not Acxiom breach?
Email addresses — used for phishing attacks and credential stuffing against your other accounts
IP addresses — combined with other data, used for identity theft and physical fraud
Names — used to build profiles and target you with personalised scams
Phone numbers — enables SIM swapping attacks and targeted SMS phishing scams
Physical addresses — combined with other data, used for identity theft and physical fraud
Is the Not Acxiom breach still dangerous in 2026?
Yes. Stolen data from the Not Acxiom breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2020 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your Not Acxiom password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the Not Acxiom breach
Approximately 51,730,831 user records were exposed in the Not Acxiom breach in June 2020.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your Not Acxiom password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full Not Acxiom dataset and tell you instantly whether your email was exposed and what data was taken.
Change your Not Acxiom password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
Who was affected by the Not Acxiom breach?
The Not Acxiom data breach affected approximately 51,730,831 users who had accounts with the service. With 51.7M records exposed, this is one of the larger breaches tracked in our database of 970+ known breaches.
If you ever created an account with Not Acxiom or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the Not Acxiom breach
Change your Not Acxiom password immediately
Go to Not Acxiom and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on Not Acxiom and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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