  Studying the population of faint hard X-ray sources along the plane of the
Galaxy is challenging because of high-extinction and crowding, which make the
identification of individual sources more difficult. IGR J18293-1213 is part of
the population of persistent sources which have been discovered by the INTEGRAL
satellite. We report on NuSTAR and Swift/XRT observations of this source,
performed on 2015 September 11. We detected three eclipsing intervals in the
NuSTAR light curve, allowing us to constrain the duration of these eclipses,
$\Delta t = 30.8^{+6.3}_{-0.0}$ min, and the orbital period of the system, $T =
6.92\pm0.01$ hr. Even though we only report an upper limit on the amplitude of
a putative spin modulation, the orbital period and the hard thermal
Bremsstrahlung spectrum of IGR J18293-1213 provide strong evidence that this
source is a magnetic Cataclysmic Variable (CV). Our NuSTAR and Swift/XRT joint
spectral analysis places strong constraints on the white dwarf mass $M_{\rm wd}
= 0.78^{+0.10}_{-0.09}$ M$_\odot$. Assuming that the mass to radius ratio of
the companion star $M_* / R_* = 1$ (solar units) and using $T$, $\Delta t$ and
$M_{\rm wd}$, we derived the mass of the companion star $M_* = 0.82\pm0.01$
M$_\odot$, the orbital separation of the binary system $a=2.14\pm0.04$
R$_\odot$, and its orbital inclination compared to the line of sight
$i=(72.2^{+2.4}_{-0.0})\pm1.0^\circ$.
