This is working as designed. Qlik Sense Enterprise on Windows uses self signed certificates for service communication (Certificates | Qlik Sense for administrators Help) and as the out-of-the-box proxy certificate.
This is not considered a security vulnerability.
If you have run a security scan and receive reports of vulnerabilities which are of concern to you, see Qlik Security Vulnerability Policy on how to report them to Qlik.
Resolution
To improve the security of your system, consider the following actions:
Environment
- Qlik Sense Enterprise on Windows