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QCD sum rules are evaluated at finite nucleon densities and temperatures todetermine the change of mass parameters for the lightest vector mesons $\rho$,$\omega$ and $\phi$ in a strongly interacting medium. For conditions relevantfor the starting experiments at HADES we find that the in-medium mass shifts ofthe $\rho$ and $\omega$ mesons are governed, within the Borel QCD sum ruleapproach, by the density and temperature dependence of the four-quarkcondensate. In particular, the variation of the strength of the densitydependence of the four-quark condensate reflects directly the decreasing massof the $\rho$ meson and can lead to a change of the sign of the $\omega$ mesonmass shift as a function of the density. In contrast, the in-medium mass of the$\phi$ meson is directly related to the chiral strange quark condensate whichseems correspondingly accessible

Evaluation of QCD sum rules for light vector mesons at finite density and temperature