Data breaches → Mytheresa
Was your data in the Mytheresa breach?
2026 · mytheresa.com · ~84,108 accounts exposedCritical severity · 10/10
Mytheresa (mytheresa.com) suffered a data breach in 2026 that exposed around 84,108 accounts. If you had an account, some of your personal data may be circulating in leaked databases. The fastest way to know is to check your own email — free, in about 30 seconds, no password required.
What happened
In April 2026, the luxury fashion e-commerce platform Mytheresa was listed as a victim of the ShinyHunters "pay or leak" extortion group. After the ransom deadline passed, the group publicly released the data which contained 84k unique email addresses. The exposed data also included names, phone numbers, physical addresses, purchases and partial credit card data including card type, last 4 digits and expiry date.
Breach details sourced from Have I Been Pwned, the industry-standard breach database. Risk analysis by Nullivo.
What was exposed, and why it matters
Not all breaches carry the same risk — what matters is which fields leaked. Here is what the Mytheresa breach exposed and what each item actually enables:
Direct financial fraud, plus convincing scam calls that quote your real card or account details to establish trust.
Home addresses feed people-search and data-broker sites, which republish them publicly. They also make phishing far more convincing and, in the worst cases, enable real-world harassment.
Enables SIM-swap attacks (hijacking your number to intercept SMS codes), smishing, and voice scams that appear to come from your bank.
Links this leak to your other accounts — a reused username lets anyone build a profile of you across platforms.
Puts you on spam and phishing lists, and confirms to attackers that you hold an account with this service — which makes impersonation emails more believable.
Also listed in this breach: Email addresses, Names, Partial credit card data, Phone numbers, Physical addresses, Purchases, Salutations.
What to do if you were affected
These steps are ordered for this specific breach — the most urgent action given what leaked comes first.
- Payment or bank details: Contact your bank, ask them to monitor or reissue the card, and check statements for small “test” transactions.
- Home addresses: Get your address removed from data brokers — they re-list roughly every four months, so this needs repeating.
- Phone numbers: Move two-factor authentication off SMS to an authenticator app or passkey, and add a port-out PIN with your mobile provider.
- Names and usernames: Search your usual username to see what else it exposes, and use distinct handles for sensitive accounts.
- Email addresses: Treat any message referencing this service with suspicion, and never act on links in unexpected emails.
- Check whether your own email appears in this breach — run a free scan to confirm before you spend time on the steps above.
This breach put your details on data-broker sites
Because Mytheresa exposed home addresses, this is one of the breaches that feeds people-search and data-broker sites. Those sites scrape leaked databases, combine them with public records, and republish the result as a searchable profile — which is how a single breach turns into a permanent public listing. Removal works, but brokers typically re-list within about four months, so it has to be repeated.
See our broker-by-broker removal guides →
How urgent is this now?
This breach is recent, so the data is actively traded and the risk is at its highest right now.
Remember: a breach can't be "un-leaked" — once a database is out, it exists in countless copies. The goal is to make the leaked data useless: change what can be changed, lock down what can't, and remove what has been republished.
Frequently asked questions
What data was exposed in the Mytheresa breach?
The Mytheresa breach exposed payment or bank details, home addresses, phone numbers, names and usernames, email addresses. Direct financial fraud, plus convincing scam calls that quote your real card or account details to establish trust.
How many people were affected by the Mytheresa breach?
Around 84,108 accounts were exposed, making it a smaller, more targeted breach.
What should I do if I had a Mytheresa account?
Contact your bank, ask them to monitor or reissue the card, and check statements for small “test” transactions. You can check whether your own email appears in this breach with a free Nullivo scan — no password required.
Breaches that exposed similar data
If the Mytheresa breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.
- Was your data in the Hot Topic breach? (2024, ~56,904,909 accounts)
- Was your data in the Kemper breach? (2026, ~269,299 accounts)
- Was your data in the University of Nottingham breach? (2026, ~454,635 accounts)
- Was your data in the T2 breach? (2024, ~94,584 accounts)
- Was your data in the Canada Goose breach? (2025, ~581,877 accounts)
- Was your data in the Otelier breach? (2024, ~436,855 accounts)