The striker’s tame looking volley from a Joe Anyinsah cross caught goalkeeper Jordan Archer unsighted and rooted to the spot.
The visitors contributed fully to an exciting game and went close on several occasions in the second half, including in a goalmouth scramble that proved the last action of the match.
Brunt had wasted Rovers’ best early chance when shooting weakly at Archer from a low Fabian Broghammer cross.
Wycombe had begun brightly, but were unable to force a testing first-half save from Steve Mildenhall.
Both sides opened up after the break and former Rovers striker Jo Kuffour had two loud penalty appeals rejected.
The result made it six wins and two draws from nine games for Rovers since Ward replaced Mark McGhee as manager, but Wycombe will feel hard done by to have left with nothing.
Chelsea will be hoping to brush off their mid-week Champions League disappointment and continue their recent domination of Leicester City when they travel to the King Power Stadium for an FA Cup quarter-final on Sunday.
Charlton have a host of injury absentees as they look to get their League One promotion bid back on track at home to Fleetwood.
Gary Rowett's injury crisis shows no sign of easing as Derby prepare to play host to Championship promotion hopefuls Cardiff.
It's 15th vs 18th at the John Smith's Stadium on Saturday, as Huddersfield and Crystal Palace meet in a crucial battle at the bottom.