MyFitnessPal 2018 Data Breach
Platform · Fitness tracking and nutrition · Health and wellness app · Global
MyFitnessPal Fitness Tracking App Breach (2018): 150 Million User Accounts Including Passwords Exposed
Fitness tracking app.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
44/100
Lower riskHigher risk
Moderate: notable exposure with meaningful misuse potential.
Data Sensitivity i
StandardExposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
150.6MRecords
2018Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Breach Summary
MyFitnessPal, owned by Under Armour at the time, suffered a data breach in February 2018 when an unauthorized party gained access to user account data. The breach exposed records tied to approximately 150 million users. The attack vector was a misconfiguration, meaning a security flaw in how the system was set up allowed direct access to the data rather than requiring a sophisticated external hack. The stolen data later appeared for sale on a dark web marketplace in 2019 and began circulating more broadly from there. The breach exposed email addresses, usernames, IP addresses, and passwords. Passwords for older accounts were stored using SHA-1 hashing, a weaker method that makes cracking them more feasible. Newer accounts used bcrypt, a stronger standard. Because MyFitnessPal tracks eating habits, exercise routines, and behavioral patterns over time, the exposed data goes beyond basic credentials. Affected users faced a layered risk: account takeover through credential stuffing, targeted phishing using health and lifestyle context, and personal profiling tied to their fitness and nutrition histories. Under Armour disclosed the breach publicly and said MyFitnessPal forced password resets and disabled the compromised passwords. No significant regulatory action was publicly reported following the disclosure. For affected users, the practical risk remains elevated years later. Stolen credentials from this breach have circulated widely, meaning anyone who reused their MyFitnessPal password on other accounts should treat those accounts as potentially compromised.
Full threat analysis, exploitation vectors, and principal guidance below.
10 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
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150.6M records analyzed
About MyFitnessPal
MyFitnessPal is a consumer health and fitness platform built around calorie tracking, nutrition logging, exercise monitoring, and behavior-change support. It operates as a large-scale wellness app that turns daily eating and activity habits into structured personal data, making it part health tool, part long-term behavioral record system.
Why They Hold Your Data
Health and fitness applications collect user accounts, emails, passwords, and behavioral data related to diet, exercise, and health routines.
Recent Developments
MyFitnessPal remains an active standalone consumer health product with a steady release cadence and visible product expansion in 2025 and 2026. Recent official updates highlight new nutrition-tracking features, recipe planning, photo-upload logging, sleep-related features, and GLP-1 support, which shows the platform continuing to deepen its role in day-to-day health management rather than remaining a static legacy app.
Data Points Exposed
4 verified field types
Email Address
IP Address
Password High
Username
Breach Impact
The 2018 breach was one of the largest consumer health-app credential exposures ever disclosed. Under Armour said an unauthorized party acquired MyFitnessPal account data in February 2018, and HIBP says the incident exposed 144 million unique email addresses along with usernames, IP addresses, and passwords stored as SHA-1 or bcrypt hashes; MyFitnessPal later said it forced password resets and disabled the old passwords. That made the breach highly useful for credential stuffing, password cracking against older accounts, phishing, and identity linkage tied to users’ health and fitness routines.
Exploitation & Downstream Threats
• Credential stuffing against reused passwords across other platforms | • Targeted phishing campaigns using exposed email addresses
Principal Risk Advisory
What this means for a principal
A consumer-service breach: contact and account data supports phishing, account takeover and profile enrichment. For a high-profile principal the main risk is credible impersonation and enrichment of existing exposure.
What You Should Do
- Reset any reused passwords and enable MFA on email first, then financial accounts.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping: cross-reference the exposed identifiers against broker-available data to size and prioritize the principal's wider footprint.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
Protect Yourself
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