rcmds.attributes/attribute allows the modification of attributes placed on items.
There are four possible subcommands add,clear,list,remove
/attribute add generic_attack_damage add_number 10 - Would give the item an attack damage attribute value of 10.
/attribute clear - Would remove all the attributes from an item.
/attribute list - Displays the current attributes for an item.
/attribute remove 5b1e88ed-6191-4a25-bf51-446b86bff5c3 - Would remove the attribute with uuid of 5b1e88ed-6191-4a25-bf51-446b86bff5c3 from an item.