Data breaches have become a defining risk of modern digital life. The Myfitnesspal breach is one of the most significant in recent memory — and if you've ever had an account with the affected service, your personal data may be circulating among cybercriminals right now.
This guide explains exactly what happened, what data was taken, and how you can check whether your information was exposed — for free, in 30 seconds.
What Happened?
The details of this breach are covered in the FAQ section below, where we answer the most important questions clearly and concisely. The key facts: who was affected, what data was taken, how attackers got in, and what the consequences have been.
Why Does This Still Matter?
Many people assume that because a breach happened years ago, the risk has passed. In reality, stolen data is sold, traded, and reused for years after a breach. Credentials from old breaches are used in credential stuffing attacks — automated attempts to log in to your other accounts using the same email and password combination.
If you reused the same password across multiple sites, one old breach can unlock dozens of your current accounts.
How to Check If You Were Affected
The fastest way is to use our free breach checker. Enter your email address and we'll scan it against known breach databases instantly — no signup required.
If your email appears in a breach, you'll see exactly which breaches affected it and what type of data was exposed. That tells you precisely where to start.
What to Do If You Were Affected
If your data was in this breach — or any breach — take these steps:
- Change the affected password immediately — especially if you reused it anywhere else.
- Enable two-factor authentication on every account that supports it, starting with email and banking.
- Check for suspicious activity on financial accounts if payment data was involved.
- Be alert for phishing — attackers use breach data to craft convincing personalised scam messages.
- Freeze your credit if your Social Security number, passport, or government ID was exposed.
Frequently Asked Questions
When did the MyFitnessPal breach happen?
The breach occurred in February 2018. Under Armour, which owns MyFitnessPal, discovered it in late March 2018 and disclosed it publicly within four days — one of the faster corporate breach disclosures on record.
What data was stolen in the MyFitnessPal breach?
150 million user accounts were affected. The stolen data included usernames, email addresses, and hashed passwords. Passwords were hashed with either bcrypt (the majority) or SHA-1. Payment card data was stored separately and was not exposed.
Is the MyFitnessPal breach still a risk today?
SHA-1-hashed passwords from the breach may already be cracked. If you used a weak or reused password on MyFitnessPal in 2018, those credentials may be available to attackers attempting credential stuffing on other sites.
How do I check if my MyFitnessPal account was breached?
Enter your email address in the free checker at Scan My Shadow. If your email appears, change your MyFitnessPal password immediately and update any accounts using the same password.
Did the MyFitnessPal breach expose health data?
Calorie logs, workout data, and dietary information were not reported as part of the stolen dataset. The breach focused on authentication credentials and account identifiers rather than health metrics.
Sources
- Under Armour – Official statement on MyFitnessPal breach
- Have I Been Pwned – MyFitnessPal breach entry
- FTC – Data Security guidance for breaches