With the game withering and with Express getting comfortable, Mugume levelled the scores at the 87th-minute mark.
A show of guile and character from KCCA FC ensured that they picked all points off historical foes Express FC in the Kampala derby at the Muteesa II Stadium, Wankulukuku, on Saturday.
Ettiene Katenga gave KCCA the lead before Express scored three in the first half, courtesy of Isaac Wagoina, John Asiimwe and Marvin Oshaba.
However, KCCA mounted a fightback in the second through Muhammad Shaban, Ashraf Mugume and Usama Arafat to give them three points to ascend ninth with 23 points in 17 matches.
In the entertaining encounter, having capitalized on defender Issa Lumu's mistake, KCCA grabbed the lead after just a minute as Katenga scored off an Ashraf Mugume pass.
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However, as the two tied 0-0 at the MTN Omondi Stadium, Lugogo, last Friday, the fans, according to Mubiru, were fully behind the team and made him feel "secure."
The hosts then found a leveller in the 23rd minute through a powerful Wagoina header off a sublime delivery from Isma Kawawulo.
Four minutes after the half-hour mark, Express led for the first time through a powerful drive from Asiimwe at the edge of the box.
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"What had happened in our club here; fans were on their own; they were only with the players when the team was winning," Mubiru noted.
Three minutes later, the Red Eagles added a third by Oshaba, who expertly tucked in a loose ball after KCCA failed to clear their lines.
Into the second half, KCCA got an early second with Shaban bending to head in a Mugume cross. It made it two assists from the latter on the evening.
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NEC's maiden double was completed last week when they beat Busoga United 3-2. They had trumped them 5-0 earlier in the campaign.
With the game withering and with Express getting comfortable, Mugume levelled the scores at the 87th-minute mark.
And, it wasn't all over for KCCA, who grabbed a winner through substitute Arafat in the 90th minute.
KCCA will return to action with another pulsating tie against league runners-up Kitara FC on February 23.
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For Desabre, this small final will also be an opportunity to leave the competition favorably: “We have to leave on a positive note."
A day earlier, Express, eighth with 25 points, will have visited Soltilo Bright Stars FC at the Kavumba Recreation Grounds.