Here's the hard truth: 98% of websites load third-party scripts. Few teams know exactly what scripts are loaded. Even fewer know what those scripts do (what elements in the browser they are interacting with), and a miniscule amount of teams have any control over what those scripts do. When I say "teams" I'm referring to different stakeholders - security engineers, risk & fraud analysts, compliance managers, and even the marketing department. That's one of the challenges of client-side security. Almost every internal department touches the website. It might be the most collectively edited environment that exists in a company.

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The old saying "prevention is better than cure" has lost currency in today's cybersecurity industry. Instead, security teams are advised to assume that the business has been breached and focus on threat detection, investigation, response, and recovery. Yet, during cyber incident post-mortems, it is not uncommon to find that the business owned the tool that would have protected it against the breach. The problem arose because it wasn't correctly configured before the incident happened, and no one knew this - or if they did, they didn't have the time or resources to fix it.