The Canada Revenue Service suspended it's online services around 1pm on Friday after it discovered a 'vulnerability'.
A notice of the online services section of the site displays a message saying:
Notice – Service temporarily unavailable
Ensuring that your personal information is not compromised is a priority for us.
Upon becoming aware of an internet vulnerability that affects some computer servers used by websites worldwide, we took down our online services, including electronic filing, and are taking steps to ensure that all information and systems remain safe.
At this time, we are not aware that any personal information has been affected; however, we continue to assess and remedy the situation.
You can still complete your tax forms, but will have to wait before filing.
We are working to bring our online services back up as soon as possible. Updates will be posted as they become available.
Thank you for your patience.
The CRA has indicated that it's not aware of any personal information being affected as a result of the issue but says it's monitoring the situation closely.
They could not provide a timeframe for the restoral of services.