Title:The Silent Takeover: How a Tiny Oversight Led to a Major Security Risk

The rabbit hole that shouldn’t exist.

It all started with an innocent recon session — just scrolling through assets, hunting for something interesting. I wasn’t expecting much, just another day of exploration. But as every security researcher knows, curiosity can sometimes lead you straight into a goldmine.

As I dug deeper, I came across something that instantly made me pause — a misconfigured setting on a third-party service. A minor mistake, but one that had the potential to cause a serious security issue. What if I told you that I could completely hijack a company’s email infrastructure? And no, this isn’t some theoretical attack; this is a live, working exploit that, if left unchecked, could be weaponized in dangerous ways.

Let’s get into it.

Third-party integrations are a blessing and a curse. They make life easier but also create dependencies that, if not properly managed, can be exploited. In this case, an external service allowed users to set up custom email domains. The problem? If a domain was left unclaimed, an attacker could swoop in, claim it, and take full control.

This kind of issue isn’t new, but the implications were particularly nasty. By taking over this domain, an attacker could: