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When a PBX gets exploited, attackers don't steal documents—they steal . One compromised extension can cost an organization tens of thousands of dollars in toll fraud within a single weekend.

The shift to VoIP has made PBX exploitation easier, not harder. Attackers don't need to splice copper wires anymore; they just need one misconfigured extension and an API call.

A Private Branch Exchange (PBX) is a telephone system used by businesses to manage internal and external communications. It allows employees to communicate with each other and with external parties through a single telephone network. PBXs are popular among businesses because they offer a range of features, including call routing, voicemail, and conference calling.

In the world of cybersecurity, we spend a lot of time worrying about firewalls, endpoints, and cloud permissions. But there is a 40-year-old piece of critical infrastructure still lurking in most office closets: the .