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The VISTA Variables in the Via L\'actea Extended Survey (VVVX) allows probingpreviously unexplored regions of the inner Milky Way (MW). We are looking fornew candidate globular clusters (GCs), with the aim of completing the census ofthe MW GC system. We searched and characterised new GCs, using a combination ofthe near-IR VVVX survey and 2MASS datasets, and the optical Gaia EDR3photometry and its precise proper motions (PMs). We report the discovery of anew Galactic GC, named Garro 02, situated at RA=18:05:51.1, Dec=-17:42:02 andl=12.042 deg, b=+1.656 deg. Performing a PM-decontamination procedure, we builta final catalogue with all cluster members, on which we performed a photometricanalysis. We calculated a reddening of $E(J-K_s)=1.07\pm 0.06$ mag andextinction of $A_{Ks}=0.79\pm 0.04$ mag in the near-IR; while $E(BP-RP)=2.40\pm0.01$ mag and $A_{G}=4.80\pm 0.02$ mag in optical passbands. Its heliocentricdistance is $D=5.6\pm 0.8$ kpc, which places Garro 02 at a Galactocentricdistance of $R_G=2.9$ kpc and Z=0.006 kpc above the Galactic plane. Weestimated the metallicity and age by comparison with known GCs and by fittingPARSEC isochrones, finding [Fe/H]$=-1.30\pm 0.2$ dex and age=$12\pm 2$ Gyr. Wederived the mean cluster PM of $(\mu_{\alpha}^{\ast}, \mu_{\delta}) = (-6.07\pm0.62, -6.15\pm 0.75)$ mas yr$^{-1}$. We calculated the cluster luminosity inthe near-IR of $M_{Ks}=-7.52\pm 1.23$ mag, which is equivalent to $M_{V}=-5.44$mag. The core and tidal radii from the radial density profile are $r_c =1.25\pm0.27$ arcmin (2.07 pc) and $r_t = 7.13\pm 3.83$ arcmin (11.82 pc),respectively. We confirm Garro 02 as a new genuine Galactic GC, located in theMW bulge. It is a low-luminosity, metal-poor, and old GC, and it is a luckysurvivor of the strong dynamical processes that occurred during the MW's entirelife.

A new low-luminosity globular cluster discovered in the Milky Way with the VVVX survey