I am running Mac Os Yosemite, 10.10.5 and I can SU to the Administrator account from a standard account on my Mac from Xquartz 2.7.8. My standard account which is configured to "not allow user to administer the account" works for my standard Mac OS account.
I consider this a security problem because the standard user account on the Mac cannot access the administrator account but Xquartz allows this to occur from within the Standard account.
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