The country's top pairing of Linline Matauatu and Miller Pata defeated Colombia's Diana Rio and Yuli Ayala 21-8 21-10.
However Vanuatu's second team of Loti Joe and Sherysyn Toko were again beaten in straight sets, against Colombia's top duo, Galindo Andrea and Galindo Claudia, 21-14 21-12.
Both of the top pairings returned for the decisive golden set, with Matauatu and Pata prevailing 17-15.
Vanuatu beat Ukraine 2-1 in their opening match-up and will complete the round robin phase tonight against Austria, who are also unbeaten in Sochi.
The two pool winners will advance directly to the Continental Cup semi-finals, with the winner of those matches qualifying for Rio.