SECURITY GUIDE
Account takeover
Learn how compromised credentials and weak account protections can put users and services at risk.
Areas to considerUser accountsAuthentication systemsAdministrative portals
01
THE CONTEXT
What to understand
Account takeover describes unauthorized control of a legitimate account. Risk increases when credentials are reused, authentication protections are weak, or unusual account activity is not detected promptly.
02
HIGH-LEVEL CONCEPT
How the risk can develop
This is a conceptual overview, not a procedure for reproducing an attack.
- Account credentials or recovery access become exposed or reused.
- Authentication safeguards do not sufficiently constrain the resulting sign-in.
- A legitimate account session is used outside its owner's intent.
03
WHY IT MATTERS
Potential impact
A compromised account may expose personal information, enable unauthorized actions, or provide a path to other systems based on that account's permissions.
04
BE AWARE
Signals to monitor
- Sign-ins from unusual locations, devices, or times for the account.
- Unexpected password, recovery, or multi-factor authentication changes.
- Atypical access to sensitive resources or sudden changes in account activity.
05
PUT DEFENSE FIRST
Recommended defenses
- 01Require multi-factor authentication, with stronger phishing-resistant methods for privileged accounts.
- 02Use unique passwords and support secure, rate-limited account recovery.
- 03Alert on suspicious sign-in patterns and provide users with a way to review active sessions.
- 04Apply least privilege and revoke sessions promptly when compromise is suspected.