In this letter a theory is developed for the treatment of the ejection of two correlated electrons from binary alloys with substitutional disorder upon the impact of fast electrons. It is shown that, under certain conditions specified in this letter, the target's electronic properties can be disentangled from the correlated two-electron scattering. For a numerical realization we employ the Korringa-Kohn-Rostoker coherent potential approximation and the virtual crystal approximation for the description of respectively the bound states and the high-energy scattering states of the electrons. Numerical results are presented and analysed for the energy correlation within an electron pair emitted from a copper-nickel alloy surface.