Jake Cooper's volley put Millwall 2-1 up at the break after Michael Obafemi and Yakou Meite traded goals during an entertaining first half in South London.
However, Neil Harris' side controlled the second half, limiting the Bluebirds to scraps, before Duncan Watmore made sure of things in stoppage time with a cool finish.
The result lifts Millwall into 16th, six points clear of the relegation zone, while Cardiff are now 11th with three games left.
Bulut insists his side need to show a winning mentality in their remaining games this season.
"Millwall at home are a good team, they are fighting. I was satisfied with (C the first half, but with the second half, I have no words for the second half," he said.
"Nobody can tell me 'two days before we had a game and we were tired', Millwall also played a few days ago.
Denne historien er fra April 14, 2024-utgaven av The Football League Paper.
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Denne historien er fra April 14, 2024-utgaven av The Football League Paper.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
Allerede abonnent? Logg på
CLASSY CURTIS GETS HIS REWARD
DERBY County have tied influential centre-back Curtis Nelson down to a new contract that will keep him at Pride Park until 2026.
STATS ALL RIGHT FOR STUDIOUS MK BOSS SCOTT
MK Dons boss Scott Lindsey has highlighted the importance of statistics following his side's recent good form.
SMITH'S FRATTON STUNNER IS TOPS!
MICHAEL Smith's stunning strike for Sheffield Wednesday against Portsmouth has won him the Sky Bet Championship Goal of the Month award for October - but he admitted it could have gone 'over the stand'!
RED DRAGONS SUFER TRIPLE INJURY SETBACK
WREXHAM'S pursuit of a historic promotion from League One has been hit by a triple injury blow.
SMART GUY LAUNCHES AI PLAN TO AID CLUBS
FORMER Rotherham, Hull and Sheffield Wednesday defender Guy Branston has launched a new AI venture that he says will revolutionise the way clubs engage with their fans.
STRIKER BISHOP JUST SO GLAD TO BE BACK
COLBY Bishop has expressed his delight at making an emotional goalscoring return for Portsmouth following open heart surgery this summer.
HUNGRY JAMIE'S IN GOAL GROOVE
Prize winner is followed by Cup heroics
TASTY TERRIERS TAKE A BITE OUT OF UNITED'S YOUNG GUNS
HUDDERSFIELD Town booked their place in the last 32 of the Bristol Street Motors Trophy in style with a thumping 4-1 home win against Manchester United U21s.
KENNY RECEIVES PRAISE OF BOSS BONNER
GILLINGHAM manager Mark Bonner says he will miss leaning on the experience of \"brilliant\" mentor Kenny Jackett.
WEAVER HAPPY TO GIVE ACE ENO HIS SHOT
HARROGATE Town boss Simon Weaver is hoping new striker Eno Nto can solve the Sulphurites' woes in front of goal.
