Why a compromised reused password can put other accounts at risk.
Short answer
Assume the reused password is exposed everywhere you used it. Start with email, banking, payment, and other high-value accounts, and give each important account a unique password.
A password exposed through one compromised account can put other accounts at risk if the same password was reused.
Prioritise your email, banking, payment, work, and primary social accounts.
Change reused passwords to unique passwords. Do not simply add a number or symbol to the old password.
Use a reputable password manager if you need help creating and storing unique passwords.
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The essentials for keeping your most important accounts locked down.
Open the checkSomething already happened?
If you entered your password on a suspicious website, treat that password as compromised. Go directly to the real service, change it, turn on MFA, and check recent account activity.
If you see activity you don't recognise, secure the affected account directly, change the password, enable MFA, review recent activity and linked devices, and contact the provider if necessary.
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