Is it mandatory to apply PRTL_6-5_Core_Fix2 to MWS 6.5.2?

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Hi All,

I am using MWS6.5.2 and am not using Portal. Is it mandatory to apply PRTL_6-5_Core_Fix2 to MWS 6.5.2 to reduce the risk of Cross site scripting vulnerability?

-Pauly