  The underlaying assumptions and uncertainties involved in the derivation of
WIMP exclusion limits from XENON10 and XENON100 detectors are examined. In view
of these, recent claims of sensitivity to light-mass Weakly Interacting Massive
Particles (WIMPs) are shown to be overstated. Specifically, bounds constraining
regions of interest in WIMP parameter space from the DAMA/LIBRA, CoGeNT and
CRESST experiments can be assigned a very limited meaning, if any.
