Summary
Acunetix 360 detected that wildcard was used in domain portion of a CSP directive.
Impact
This means you trust all of the subdomains of this domain, if this is the case there is no impact.
Remediation
If you trust all of the subdomains and if this is necessary then you do not need to take any actions. However if this is not the case replace the wildcard with the only subdomain that you trust.