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Nigel Clough's Burton Albion burst Cardiff City's bubble as they ended their five-match unbeaten start to the season to progress to the third round of the Carabao Cup.
Goals from Tom Naylor and Ben Fox sealed sweet revenge for the Brewers, who were beaten 1-0 at home by a late goal on the opening day of the Championship season by the Bluebirds.
New signing Omar Bogle almost scored with his first touch on his Cardiff debut after joining from Wigan Athletic last week but, after a bright start, the home side were overrun in midfield and fell behind to Naylor's goal after failing to clear a corner.
Naylor almost stuck again on the stroke of half-time and Lucas Akins was only denied by a brilliant save from Brian Murphy in the home goal less than a minute after the re-start.
Cardiff then tested Connor Ripley in the Burton goal as he was forced to push away a smart shot from Cameron Coxe and was happy to see a Lee Tomlin free kick just go over the bar.
The visitors doubled their lead in the 70th minute when a pin-point cross from the left by Joe Sbarra was headed home for by Fox to leave the Bluebirds with a mountain to climb.
Three minutes after coming on, though, Anthony Pilkington glanced a Tomlin free-kick into the top corner to give the Championship leaders a lifeline with 14 minutes left to play.
Danny Ward then pushed a great chance to equalise wide of the mark and Clough's men were able to hang on for a notable triumph.
Cardiff City: Murphy, Coxe, Manga, Connolly, Richards; O’Keefe, Halford (Damour, 80), Kennedy (Mendez-Laing, 78), Tomlin, Ward, Bogle (Pilkington, 74).
Subs not used: Etheridge, Peltier, M. Harris, Meite.
Burton: Ripley, Turner (capt.), Scannell (Sordell, 61), Akins, Flanagan, McCrory, Naylor, Harmer, Fox (McFadzean, 76), Sbarra (Murphy, 90), Irvine.
Subs not used: Campbell, Dyer, Barker.
Goals: Naylor (27), Fox (70), Pilkington (76)
Yellow cards: Coxe (32), Irvine (68)
Referee: John Busby
Attendance: 5,820
Neil Warnock:
“We’re disappointed to be out of the Cup but not heartbroken. It’s a blessing that we haven’t picked any injuries up tonight. We created enough chances to have won the game, but we didn’t take them.
“We made ten changes tonight, but I think some of the new boys did well. (Cameron) Coxey did alright; a pleasing debut for him. I thought Bruno held us together, and Connolly got his first game under his belt for a while. We managed to get Omar into the game as well, so there were some plusses.”
“I don’t envisage many changes from last week. I think we’re in a good place at the minute, and I didn’t want to risk anybody tonight for obvious reasons.
"I think it’s an important game on Saturday, before the international break.
"We’re not in a Cup competition until January now, so we can focus on the League. I think September and October are our most difficult two months, really.
"If we can be in that top six by the end of October I’ll be delighted.”
Nigel Clough:
"I thought it was a very good performance.
"The only thing we are disappointed with is that we ended up hanging on at the end, which the first 75 minutes of the game didn't deserve, or didn't warrant us to be hanging on at the end.
"The chances that we had tonight and the situations, we should have been maybe three goals ahead or something like that and it wouldn't have mattered.