During the rogue period, the person acting as the axed breakfast show host reportedly liked two comments which criticised the Today show and his former colleagues.
Sharing the news on his Instagram stories, the 44-year-old said he would be taking a short break on social media while the problem was being resolved by authorities.
“While I was out fishing my Instagram account has been hacked. I am investigating this with the authorities and will be back soon. Karlos,” he wrote.
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While his Instagram was under siege, Stefanovic was seen liking one comment that simply said, “The audience want answers,” while another was more scathing towards his ex co-host, Georgie Gardner.
“Won’t be watching. Well, Miss Gardiner [sic] got her way. Pathetic, smile, agree and laugh. It’s all they do,” it read.