On Wikipedia for the Canadian Victoria Cross it says (heading Criteria) " and, unlike its British counterpart, may be revoked.[14] The ref 14 says the original source is dated 2008
Also Wikipedia
Victoria Cross forfeitures
"The original Royal Warrant involved an expulsion clause that allowed for a recipient's name to be erased from the official register in certain wholly discreditable circumstances and his pension cancelled.[64] King George V felt very strongly that the decoration should never be forfeited and in a letter from his Private Secretary, Lord Stamfordham, on 26 July 1920, his views are forcibly expressed:
The King feels so strongly that, no matter the crime committed by anyone on whom the VC has been conferred, the decoration should not be forfeited. Even were a VC to be sentenced to be hanged for murder, he should be allowed to wear his VC on the scaffold.[29]
The power to cancel and restore awards is still included in the Victoria Cross warrant but none has been forfeited since 1908.[29] reference 29 is "Posthumous VCs". National Army Museum. Retrieved 16 June 2007