AT&T clients warned of data breach affecting 9 million

AT&T clients warned of data breach affecting 9 million

The telecommunications giant AT&T has reached out to customers over a third-party data breach that exposed user details. The company said nine million accounts might have been exposed.

One of the world’s largest telecom providers, AT&T started sending out letters to its users over a data breach that one of its vendors suffered.

“We recently determined that an unauthorized person breached a vendor’s system and gained access to your Customer Proprietary Network Information (CPNI),” AT&T’s breach notification letter said.

According to AT&T, around nine million wireless accounts had their CPNI exposed. Threat actors accessed data that “was several years old” and related to device upgrade eligibility.”

“A vendor that we use for marketing experienced a security incident. Customer Proprietary Network Information from some wireless accounts was exposed, such as the number of lines on an account or wireless rate plan,” AT&T told Cybernews.

The company said that the exposed data did not include credit card information, any passwords or social security numbers.

AT&T said the breach prompted it to contact law enforcement agencies as well as the Federal Communications Commission (FCC).

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