Schneider Electric Wonderware Information Server (WIS) Portal 4.0 SP1 through 5.5 uses weak encryption, which allows remote attackers to obtain sensitive information by reading a credential file.
https://www.cisa.gov/news-events/ics-advisories/icsa-14-238-02
https://ics-cert.us-cert.gov/advisories/ICSA-14-238-02
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2014/icsa-14-238-02.json