The agency doesn't stipulate the vulnerability it identified, merely saying it affected "websites worldwide", prompting it to "temporarily take down our online services, including electronic filing" while it applied patches.
The Canadian Revenue Agency (CRA) website is back up and running.
"We continue to assess and remedy the situation", Samson said.
Among the services that were not available on Saturday were Netfile, Efile, and the MyBenefits mobile application.
"We took this action as a precaution, not as the result of a successful hack or breach", the CRA's follow-up statement, still accessible at press time, read.
Taking a look at the Michigan's chances in the Midwest Region
Miami's calling card is their defense, and that is something that will, hopefully, travel with them during the NCAA tournament. Awaiting the Jayhawks after that opener in Tulsa would be the victor of the Miami-Michigan State game.
John Glowacki with Shared Services Canada says IT security officials were made aware of a bug in a computer program widely used by the federal government late Wednesday.
The agency has advised that residents can still fill out their tax forms electronically, but will have to wait until the website is fully operational again to submit them.
If you attempted to file your return as the website went down, the CRA says the return was only filed if you received a confirmation code.
"We are now confident that the solution has been rigorously and successfully tested and services returned online", the agency said.
Tax returns that had already been filed were processed normally while the services were down and Canadians should not "expect a delay in getting their refund", CRA said.