The Swans established an early lead when Wilfried Bony netted his eighth goal of the season before the Russians bit back in stoppage time through Ibrahima Balde.
A fortnight earlier, Djibril Cisse also scored a last-gasp penalty at the Liberty Stadium as Kuban stole a point at the death in the reverse fixture.
Depsite the setback, Swansea remain second in Group A with two games to play, knowing victory against Valencia at home or St Gallen away will seal a place in the round of 32.
"It was a similar situation to two weeks ago," Vorm told the club's official site. "But we played much better than when we played them at home, so that was one positive.
"We were very strong in the first half; we created lots of chances and had good possession.
"We struggled a little bit more in the second half but even so, when they go down to 10 men it is impossible to give a goal away - but we did. So that was very disappointing.
"It would have been good to get the second goal, but on top of that you need to keep your concentration for 90 minutes. Not even talking about the goal, but we need to keep the ball better for the last fifteen minutes.
"But this feels like a loss and in two games we've lost four points. That is hard to take, but that's football."
Swansea host Valencia on November 28 in a bid to secure their fate and Vorm insists Michael Laudrup's men know exact what is expected of them.
"We have eight points now and we didn't get beat," the Dutchman added. "It is in our own hands and we now play Valencia at home and St Gallen away.
"We need to win one of those and then we're there.
"That is why it is so special to talk about what we're doing right now - and we shouldn't forget that."