Apple has suffered another embarrassment. A security breach has exposed iPad owners including dozens of CEOs, military officials, and top politicians. They—and every other buyer of the cellular-enabled tablet—could be vulnerable to spam marketing and malicious hacking. The breach, which comes just weeks after an Apple employee lost an iPhone prototype in a bar, exposed the most exclusive email list on the planet, a collection of early-adopter iPad 3G subscribers that includes thousands of A-listers in finance, politics and media, from New York Times Co. CEO Janet Robinson to Diane Sawyer of ABC News to film mogul Harvey Weinstein to Mayor Michael Bloomberg. It even appears that White House Chief of Staff Rahm Emanuel’s information was compromised.

It doesn’t stop there. According to the data we were given by the web security group that exploited vulnerabilities on the AT&T network, we believe 114,000 user accounts have been compromised, although it’s possible that confidential information about every iPad 3G owner in the U.S. has been exposed. We contacted Apple for comment but have yet to hear back. We also reached out to AT&T for comment. A call to Rahm Emanuel’s office at the White House has not been returned.

The specific information exposed in the breach included subscribers’ email addresses, coupled with an associated ID used to authenticate the subscriber on AT&T’s network, known as the ICC-ID. ICC-ID stands for integrated circuit card identifier and is used to identify the SIM cards that associate a mobile device with a particular subscriber. The subscriber data was obtained by a group calling itself Goatse Security. Though the group is steeped in off-the-wall, 4chan-style internet culture—its name is a reference to a famous gross-out Web picture—it has previously highlighted real security vulnerabilities in the Firefox and Safari Web browsers, and attracted media attention for finding what it said were flaws in Amazon’s community ratings system.