This is not PeopleSoft, it is a problem with the WebLogic server which is what Oracle cloud and everything else is running on.
The vulnerability ALSO affects Oracle's PeopleSoft software, which CAN include WebLogic as a server.
An Oracle WebLogic vulnerability fixed in October last year is being exploited on unpatched machines to mine Monero, a cryptocurrency, and other lesser-known imaginary coins.
The problem is in the crap WebLogic server that Oracle got from BEA. I'm sure all the people from BEA who knew what they were doing are long gone, acquisition happened in 2008.
Oracle cloud is crap.