Cybersecurity & privacy

How to know if my account has been hacked

KKahu team·Updated 2 Oct 2026·5 min read

Illustration for the KahuLogic guide: How to know if my account has been hacked
Quick answer

The clearest signs are being unable to log in, security settings you did not change, messages sent from your account that you did not write, sign-ins from unfamiliar places or devices, and purchases or transfers you did not make. Check your account's security or login activity page to confirm.

The obvious signs

The UK's National Cyber Security Centre lists the signs that most often mean someone else has been in an account. Any one of them is worth acting on straight away.

  • You cannot log in, even with the right password.
  • Your security settings, recovery phone or recovery email have changed.
  • Friends, followers or customers receive messages from you that you did not send.
  • There are logins, or attempts, from strange places or at unusual times.
  • Money has moved or purchases have been made that you did not make.

The quieter signs

A careful attacker tries not to be noticed, especially in email, where they can watch conversations and wait for an invoice to interfere with. Google's own guide to a compromised account mentions several of these.

  • Forwarding rules or filters in your email that you did not create.
  • Emails in your sent folder that you did not write.
  • Contacts telling you they received spam or odd requests from you.
  • Two-step verification turned off or changed without your action.
  • Files deleted or shared, or posts and uploads you did not make.
Check the rulesAn unknown email forwarding rule is one of the clearest signs someone is watching your inbox.

Where to check

  1. 1Open the security pageMost services have one: in Google it is Security in your Google Account, and many others call it login activity or where you're logged in.
  2. 2Look at recent sign-ins and devicesAnything you do not recognise, in a place you have not been, deserves attention.
  3. 3Check email settingsLook at forwarding, filters and connected apps, not just your inbox.
  4. 4Check your bank and payment accountsLook for transactions you do not recognise.
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What to do if you see a sign

Do not wait to be sure. Change the password from a device you trust, sign out of all other sessions, turn on two-step verification and tell your bank if money is involved. If you cannot get in at all, use the service's official recovery page, which you should find by going to the site directly rather than following a link in a message. Our guide to recovering a hacked account walks through it step by step.

Frequently asked questions

Does a 'new sign-in' alert mean I've been hacked?

Not always. It may be you on a new device. If it was not you, act straight away, but open the app or site yourself rather than using the alert's link.

Can I be hacked without noticing anything?

Yes. That is why it is worth checking email forwarding rules and sign-in activity every few months.

My password appeared in a data breach. Am I hacked?

Not necessarily, but change that password and anywhere you reused it, and turn on two-step verification.

Further reading

  1. NCSC: Recovering a hacked accountncsc.gov.uk
  2. Google Account Help: Secure a hacked or compromised accountsupport.google.com
  3. Own Your Online: Get help nowownyouronline.govt.nz