Rockwell Automation Connected Components Workbench v12.00.00 and prior does not limit the objects that can be deserialized. This vulnerability allows attackers to craft a malicious serialized object that, if opened by a local user in Connected Components Workbench, may result in remote code execution. This vulnerability requires user interaction to be successfully exploited.
https://www.cisa.gov/uscert/ics/advisories/icsa-21-133-01
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1131435