In Stimulsoft Designer (Desktop) 2023.1.5, and 2023.1.4, once an attacker decompiles the Stimulsoft.report.dll the attacker is able to decrypt any connectionstring stored in .mrt files since a static secret is used. The secret does not differ between the tested versions and different operating systems.
https://cves.at/posts/cve-2023-25263/writeup/