There&#x27;s also a subtle problem of mistrust in all this.<p>Ad creatives have evolved from just simple banner images to more rich media but those files are relatively safe. The biggest problem is the explosion of javascript tags used for verification and analysis because a lack of trust and politics has led agencies&#x2F;advertisers to require layers of external tracking.<p>This requirement has forced ad networks to support 3rd party javascript tags - which is basically impossible to verify for security. If you can run javascript on a page, you can control that page.<p>Fundamentally there needs to be more regulation, standards and actual enforcement to fix this.