Your domain’s security can be compromised by embedding iframes from untrusted third party sites. Sometimes hackers inject malicious code into legitimate websites to spread malware downloads and infect computers of visitors on your site. This exposes your site to the risk of getting listed as a malware source with Google and may have a very negative impact on your site’s reputation.
These types of attacks are referred to as “Drive-by Download attacks“.
Add the following code to protect your website and your website visitors against Drive-by Download attacks.