The problem is misbehaviour in wordpress and not a wrong setting in ispconfig. If wordpress does not find its config file, it tries to traverse the path downwards and tries to find the file wp-config.php in other locations. So wordpress tries to open folders that it is not allowed too because they are outside of its web directory and this triggers the open_basedir.
You can disable open_baesdir of course by simply setting / as open_basdir path, but thst quite insecure as it allows all your website users to read the mysql passwords and other data of other websites.
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