Dutch Data Breaches: Check If Your Email Was Exposed

Dutch companies have been hit by major breaches

If you live or work in the Netherlands, there's a good chance your email address has been exposed in a data breach at a Dutch company. Major breaches have affected telecom providers, fitness clubs, retailers, and other businesses.

The good news: you can check for free in seconds. And if your email was exposed, there are clear steps you can take to protect yourself.

Major Dutch data breaches

Odido (T-Mobile Netherlands)

Odido, the main Dutch mobile brand (formerly T-Mobile Netherlands), experienced a significant data breach in early 2026. According to reports from Dutch broadcaster NOS and tech site Tweakers, the breach involved phishing of customer support staff, social engineering of two-factor authentication codes, and automated scraping of customer data. Affected customers may have had their mobile numbers, email addresses, and billing information exposed.

Read our full Odido breach guide

Basic Fit

Basic Fit, the Dutch fitness chain, suffered a data breach that exposed customer information including email addresses, phone numbers, and membership details. Basic Fit is a major fitness provider in the Netherlands with hundreds of thousands of members.

Read our full Basic Fit breach guide

Other Dutch breaches

Beyond Odido and Basic Fit, email addresses from Dutch companies appear regularly in breach databases. These include smaller retailers, services, and platforms. Each breach exposes different data types—sometimes just email addresses, sometimes passwords, phone numbers, or payment information.

Check if your email was in a Dutch breach

You don't need to guess which Dutch breaches affected you. Use a free breach check tool to find out in seconds.

The check is powered by Have I Been Pwned, the most comprehensive breach database worldwide. No account is required, and your email is not stored.

What to do if your email was in a breach

Step 1: Change your password

If your email was exposed in a Dutch breach, change your password for that service immediately. Use a strong password that you haven't used anywhere else. A strong password is at least 12 characters and includes uppercase, lowercase, numbers, and symbols.

Step 2: Check for reused passwords

If you used the same password on other accounts, change those passwords too. Attackers often test exposed passwords across multiple websites. This is especially important for your email account, banking apps, and work accounts.

Step 3: Enable two-step verification

Enable two-step verification on your most important accounts: email, banking, and work. Even if someone has your password, they can't access your account without the second verification step. Most Dutch banks and email providers support this.

Step 4: Watch for phishing

Be cautious of emails that claim to be from Dutch companies. Scammers often use breach data to create convincing phishing emails, especially targeting Dutch customers. Legitimate companies never ask for your password by email. If you receive a suspicious email, don't click any links—go directly to the official website instead.

Monitor for future Dutch breaches

New Dutch breaches happen regularly. Instead of checking manually every few months, use an automated breach monitoring service that watches your email automatically.

SecurityScore.me monitors your email address and alerts you instantly if it appears in any new breach—Dutch or international. You can monitor your work email, personal email, and any other email addresses you use.

The service monitors every day and sends email alerts within 24 hours of a breach. No credit card required to start.

What Dutch companies must do after a breach

Under Dutch law (part of GDPR), companies that experience a data breach must notify affected customers within a certain timeframe. Dutch companies also must report breaches to the Dutch Data Protection Authority (Autoriteit Persoonsgegevens).

If a Dutch company was breached:

• Watch your email for official notification from the company
• The company should explain what data was exposed
• The company should advise what steps to take
• Check official Dutch news sources (NOS, Tweakers, etc.) for reporting on major breaches

If you don't receive notification from a company but found that your email was in their breach, the company may not have had your correct contact information, or they may still be investigating. Either way, you should take protective steps yourself.

Summary

Major Dutch companies have experienced data breaches. The first step is to check if your email was affected. If it was, change your password, check for reused passwords, enable two-step verification, and watch for phishing.

Going forward, monitor your email automatically so you're alerted the moment it appears in any new breach. This takes the guesswork out of staying safe online—for Dutch breaches and beyond.