Password leaked: What to do after a data leak?
If a password has been leaked, speed matters: change password, check reuse, end active sessions and activate MFA.
The first 15 minutes after the leak
As soon as you learn of a leak, you should immediately replace the affected password. Even more important is the question of whether the same password has been used elsewhere.
A compromised password is rarely a problem for just one service. Attackers continue to systematically test leaked combinations.
The most important immediate measures
- Change the password of the affected account immediately.
- Identify any other accounts with the same or similar password and update them as well.
- Check active sessions, log out and turn on MFA.
When the situation is more critical
Things get particularly serious with email accounts, password managers, company access and banking logins. These accounts often serve as a starting point for further acquisitions.
In such cases, a silent password update is not enough. Then recovery data, devices, security questions and login histories should be checked.
Quick checklist
The most important actions from this guide in compact form.
- First change the affected account, then replace any reused passwords.
- Activate MFA or check whether it is still configured correctly.
- For critical accounts, check the recovery email, phone number and active devices.
Common questions
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