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We present the characterisation of the massive cluster ClG-J$104803.7+313843$at $z=0.76$ performed using a serendipitous XMM-Newton observation. Highredshift and massive objects represent an ideal laboratory to benchmark ourunderstanding of how cluster form and assembly formation driven mainly bygravity.Leveraging the high throughput of XMM-Newton we were firstly able todetermine the redshift of the object, shedding light on ambiguous photometricredshift associations. We investigated the morphology of this cluster whichshows signs of merging activities in the outskirts and a flat core. We alsomeasured the radial density profile up to $R_{500}$. With these quantities inhand, we were able to determine the mass, $M_{500}=5.64^{+0.79}_{-0.62} \times10^{14}M_{\odot}$, using the YX proxy. This quantity improves previousmeasurement of the mass of this object by a factor of $\sim 3.5$. Thecharacterisation of one cluster at such mass and redshift regime is fundamentalas these objects are intrinsically rare, the number of objects discovered sofar being less than $\sim 25$. Our study highlights the importance of usingX-ray observations in combination with ancillary multi-wavelength data toimprove our understanding of high-z and massive clusters

X-ray characterisation of the massive galaxy clusterClG-J104803.7+313843 at z=0.76 with XMM-Newton