When a service you use discloses a breach, the first question is usually the same: was I affected? One Japanese user, who says he is a victim of the Times Car data breach himself, asked that question about every service he uses. He then published a compilation of personal information leaks and breaches from domestic services over the past year, with guidance on where passwords should be changed. His list is a useful prompt for everyone to check if your data leaked in services you have long forgotten about.
A note on sourcing: the excerpt of the original article available to us is brief, so this post does not repeat details of individual breaches. Instead, it uses the author's approach as a template you can apply to your own accounts.
What the Times Car Breach Shows About Account Exposure
The author's starting point is worth noting. He did not set out to write a breach roundup. He became a victim of one incident, then wondered what else might have slipped through over the past year. That is a sensible reaction, because a single notice rarely tells the whole story.
Most people spread their details across dozens of services: car sharing, shopping, cloud storage, travel, delivery. Each one holds some combination of your name, email, phone number, address, and sometimes payment or login data. You do not control how well any of them protects it. When one provider is breached, the exposure follows you even if your own device was never compromised.
That provider-side risk is the key lesson. The Rakuten Drive breach affecting 15,000 accounts is another example of how an incident at a service can put the data you stored with it at risk, regardless of how careful you were personally.
How to Check Which Services Have Leaked Your Data
You can borrow the author's method in a few steps:
- List your services. Search your email inbox for welcome messages, receipts, and password reset emails from the past few years. Include every address you have used.
- Look for notices. Search your inbox for words like "unauthorized access," "security incident," or "important notice." Companies usually email affected customers, and these messages are often filtered into spam.
- Use breach-lookup tools. Reputable breach search services let you enter an email address or phone number and see whether it appears in known leaked datasets. Use well-established services, and never enter your password into one.
- Check company announcements. For services you actually use, look at the official news or security pages. A compiled list like the author's can help you cross-reference names.
- Record what you find. Note the service, the date, and which data types were reportedly exposed.
A lookup returning no results does not prove you are safe. Not every breach is publicly known or indexed. Treat the tools as one signal among several.
Which Passwords to Change First
You do not need to change everything at once. Prioritize by the damage a takeover could cause:
- Your primary email account. It resets almost everything else, so it comes first.
- Any account named in a breach notice. Change the password even if the company says passwords were not exposed.
- Financial, payment, and shopping accounts with saved cards or points balances.
- Cloud storage and backup accounts, which may hold identity documents, photos, and work files.
- Any account sharing a password with a breached one. Reuse is the main way one leak becomes many.
Also review what else was exposed. If a notice lists phone numbers or addresses rather than passwords, a password change will not help much; instead, expect more convincing phishing and scam messages and treat unexpected links and calls with suspicion.
Locking Down Accounts With 2FA and a Password Manager
Once you have changed the urgent passwords, make the next breach less costly.
Use a password manager. It generates a long, unique password for every service, so a leak at one provider cannot unlock another. You only have to remember one strong master passphrase.
Turn on two-factor authentication (2FA). Prefer an authenticator app or a hardware security key over SMS codes where the service offers them. Even if a password leaks, an attacker still needs the second factor.
Review sign-in activity and connected apps. Log out of unknown devices and remove third-party access you no longer use.
Delete what you do not need. Close accounts for services you have stopped using. Data that is not stored cannot be leaked.
What This Means For You
Breaches at services you use are largely outside your control, but your response is not. Knowing which of your accounts were affected lets you act on the right ones first, and unique passwords plus 2FA limit how far a single leak can spread. A VPN does not protect data that a company stores on its own servers, so account hygiene matters more than network tools in this situation.
Takeaways
- Set aside time this week to check if your data leaked across the services you use.
- Search your inbox for breach notices and build a simple list of affected accounts.
- Change your email password first, then financial and cloud accounts.
- Adopt a password manager and enable 2FA everywhere it is offered.
- Close unused accounts, and review how you store files with online providers, as the Rakuten Drive incident shows that provider-side problems can reach stored data.
An hour of auditing now is far easier than recovering a compromised account later.
