Hunt was easily beaten for Blackburn's goal, but his error proved trivial as Wednesday recovered to win 2-1.
Wednesday had finished the first half by far the stronger, but were stunned just seconds after the restart when Rovers' Craig Conway headed into the far corner from 15 yards out.
Darragh Lenihan was allowed far too much time to line up the cross from the right, though questions must be asked of the marking when a 5ft 7 winger is able to score with his head from such a distance.
Afterwards, Owls right-back Jack Hunt took to Twitter to acknowledge his error.
For their goal I hold my hands up my mistake but these things happen in football. We recover and go again Saturday @swfc— Jack Hunt (@Hunty32) 5 April 2016
"For their goal I hold my hands up my mistake but these things happen in football," Hunt posted.
Luckily for him, Wednesday weren't behind for long, with Ross Wallace's cross deflecting in off Adam Henley in the 51st minute.
Conway was dismissed for a tackle on Alex Lopez two minutes later and Wallace struck the Owls' winner shortly after the hour mark.
Wednesday, who'd kept four consecutive clean sheets before Tuesday, need just two more to match the club-record of 17 in a single season, which has happened twice previously.