CentOS 7.4 with ISpmanager permissions problem
I think its bug need to fix urgent basis.
When try to Update WordPress going to same error. Cannot update wordpress http://www.XXXXX/wp-admin/ Downloading update from https://downloads.wordpress.org/release/wordpress-4.9.5-no-content.zip…; Unpacking the update… Could not create directory. Installation Failed
The directory sites/default/files does not exist. An automated attempt to create this directory failed, possibly due to a permissions problem.