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We present the discovery of CoRoT 223992193, a double-lined, detachedeclipsing binary, comprising two pre-main sequence M dwarfs, discovered by theCoRoT space mission during a 23-day observation of the 3 Myr old NGC 2264star-forming region. Using multi-epoch optical and near-IR follow-upspectroscopy with FLAMES on the Very Large Telescope and ISIS on the WilliamHerschel Telescope we obtain a full orbital solution and derive the fundamentalparameters of both stars by modelling the light curve and radial velocity data.The orbit is circular and has a period of $3.8745745 \pm 0.14$ days. Themasses and radii of the two stars are $0.67 \pm 0.01$ and $0.495 \pm 0.007$$M_{\odot}$ and $1.30 \pm 0.04$ and $1.11 ~^{+0.04}_{-0.05}$ $R_{\odot}$,respectively. This system is a useful test of evolutionary models of younglow-mass stars, as it lies in a region of parameter space where observationalconstraints are scarce; comparison with these models indicates an apparent ageof $\sim$3.5-6 Myr. The systemic velocity is within $1\sigma$ of the clustervalue which, along with the presence of lithium absorption, strongly indicatescluster membership. The CoRoT light curve also contains large-amplitude,rapidly evolving out-of-eclipse variations, which are difficult to explainusing starspots alone. The system's spectral energy distribution reveals amid-infrared excess, which we model as thermal emission from a small amount ofdust located in the inner cavity of a circumbinary disk. In turn, this opens upthe possibility that some of the out-of-eclipse variability could be due tooccultations of the central stars by material located at the inner edge or inthe central cavity of the circumbinary disk.

CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk