function XMLRPCremoveUserGroupPriv($name, $affiliation, $nodeid, $permissions){
    require_once(".ht-inc/privileges.php");
	global $user;

    if(! checkUserHasPriv("userGrant", $user['id'], $nodeid)){
		return array('status' => 'error',
                     'errorcode' => 53,
                     'errormsg' => 'Unable to remove group privileges on this node');
    }

	$validate = array('name' => $name,
	                  'affiliation' => $affiliation);
	$rc = validateAPIgroupInput($validate, 1);
	if($rc['status'] == 'error')
		return $rc;

    $groupid = $rc['id'];
    $groupname = "$name@$affiliation";
    $perms = explode(':', $permissions);
    $usertypes = getTypes('users');
    array_push($usertypes["users"], "block");
	array_push($usertypes["users"], "cascade");
    $cascadePrivs = getNodeCascadePriviliges($nodeid, "usergroups");
    $removegroupprivs = array();
    if(array_key_exists($groupname, $cascadePrivs['usergroups'])){
        foreach($perms as $permission){
            if(in_array($permission, $cascadePrivs['usergroups'][$groupname]['privs'])){
                array_push($removegroupprivs, $permission);
            }
        }
        $diff = array_diff($cascadePrivs['usergroups'][$groupname], $removegroupprivs);
        if(count($diff) == 1 && in_array("cascade", $diff)){
            array_push($removegroupprivs, "cascade");
	}
	}
    if(empty($removegroupprivs)){
		return array('status' => 'error',
                     'errorcode' => 53,
                     'errormsg' => 'Invalid or missing permissions list supplied');
	}

    updateUserOrGroupPrivs($groupid, $nodeid, array(), $removegroupprivs, "group");
    return array('status' => 'success');
}
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.