BREAKING: CRA faces potential hacking incident, 800,000 taxpayers locked out of online accounts

In a statement, the CRA said that user IDs and passwords were not compromised in the breach, but rather they may have "been obtained by unauthorized third parties and through a variety of means by sources external to the CRA.

“The total number of accounts impacted is roughly 800 thousand," the CRA told CTV News.

The CRA had faced similar cyber security threats in February. The CRA says they are notifying the public, as it is tax season. Those attempting to log in may see messages saying their CRA ID had been revoked, though this will be due to the lockout.

Those impacted by the events will be notified by email, as well.

The agency says that taxpayers will be able to login to their accounts by creating a new CRA user ID and password, or by using alternate login methods.

Issues could last until March 22. If one can still not log in to their account, they are urged to contact the CRA.

“All Canadians should monitor their CRA accounts for any suspicious activity including unsolicited changes to banking, mailing address or benefit applications made on their behalf. In addition, passwords should be updated regularly,” the CRA said in a statement.