ARC Informatique PcVue prior to version 12.0.17 is vulnerable to a denial-of-service attack due to the ability of an unauthorized user to modify information used to validate messages sent by legitimate web clients. This issue also affects third-party systems based on the Web Services Toolkit.
https://www.pcvuesolutions.com/support/index.php/en/security-bulletin/1076-security-bulletin-2020-1
https://www.pcvuesolutions.com/security