critical severity February 01, 2018 · 2 min read

MyFitnessPal — 144 Million Accounts, and Whether Yours Was Safe Depended on When You Joined (2018)

If you are a customer of MyFitnessPal, here’s what’s now in circulation.

MyFitnessPal used SHA-1 for older accounts and bcrypt for newer ones. Whether your password survived depends entirely on your signup date — and nobody tells you which side of that line you were on.

One dataset split between a fast hash and a slow one

What happened

In February 2018 the diet and exercise service MyFitnessPal was breached, exposing 143,606,147 unique email addresses alongside usernames and IP addresses. In 2019 the data was listed for sale on a dark-web marketplace among the GnosticPlayers batches and subsequently circulated widely.

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Two different breaches wearing one name

The password storage is the unusual part and it is genuinely important. MyFitnessPal stored passwords as SHA-1 for earlier accounts and bcrypt for newer ones. The company had migrated its hashing at some point, and the breach caught it mid-transition.

The practical consequence is that this single breach has two completely different risk profiles. If your account predates the migration, your password was protected by a fast hash and should be considered recoverable. If it postdates it, bcrypt almost certainly held.

And here is the part no advice column will tell you: you have no way to find out which group you are in. The migration date was never published, your signup date is not something most people remember, and the dataset does not annotate it. The only safe assumption is the pessimistic one — that yours was SHA-1.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Severity Critical contact details only, none of them permanent

Disclosed February 01, 2018

Last reviewed July 22, 2026

Affected 143.6M email addresses

Data exposed Email addressesUsernamesPasswordsIP addresses

By GalaxyWarden Threat Research · Editorial & sourcing standards

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

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