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Context: Young massive clusters are key to map the Milky Way's structure, andnear-IR large area sky surveys have contributed strongly to the discovery ofnew obscured massive stellar clusters.  Aims: We present the third article in a series of papers focused on young andmassive clusters discovered in the VVV survey. This article is dedicated to thephysical characterization of VVV CL086, using part of its OB-stellarpopulation.  Methods: We physically characterized the cluster using $JHK_S$ near-infraredphotometry from ESO public survey VVV images, using the VVV-SkZ pipeline, andnear-infrared $K$-band spectroscopy, following the methodology presented in thefirst article of the series.  Results: Individual distances for two observed stars indicate that thecluster is located at the far edge of the Galactic bar. These stars, which areprobable cluster members from the statistically field-star decontaminated CMD,have spectral types between O9 and B0V. According to our analysis, this youngcluster ($1.0$ Myr $<$ age $< 5.0$ Myr) is located at a distance of$11^{+5}_{-6}$ kpc, and we estimate a lower limit for the cluster total mass of$(2.8^{+1.6}_{-1.4})\cdot10^3 {M}_{\odot}$. It is likely that the clustercontains even earlier and more massive stars.

Massive open star clusters using the VVV survey III: A young massive cluster at the far edge of the Galactic bar