Not sure if $taboo was getting sanitized or not. Possibly an SQL injection vulnerability that allows maliciously crafted group names to inject SQL at a later date when the group CP is loaded. Unconfirmed, theoretical fix.

// UK lang variables

tinyMCE.addToLang('',{
directionality_ltr_desc : 'Direction left to right',
directionality_rtl_desc : 'Direction right to left'
});