Account information of more than 320,000 Time Warner cable customers were jeopardized following the recent hack that exposed some of the company's system vulnerability. Sensitive user information were stolen mostly via malware injection and phishing attacks.

As part of the company's contingency plan, Time Warner cable customers are strongly advised to change their password as soon as possible.

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What surprises many online security experts is that Time Warner did not discover the breach. Instead, the United States Federal Bureau of Investigation alerted the communications giant of the breach explaining that customer data have been compromised.

Initial reports claim that usernames, passwords and other sensitive user information were stolen. It is still unknown whether credit card and banking information were also compromised.

Time Warner is not exactly sure how customer information were obtained, or stolen. The company has yet to determine whether perpetrators use an unpatched security loophole or whether it is a breach into the company's own computer system.

In a statement acquired by Venture Beat, Time Warner said, "For those customers who account information was stolen, we are contacting them individually to make them aware and to help them reset their passwords. Additionally, through our website, we provide several tips for how to navigate the Web more carefully and how to avoid phishing schemes."

Time Warner added that they are currently investigating the issue and points out that there is a big possibility that the breach came from one of the third-party companies the cable company is working with.

According to Lifehacker, Time Warner said that customers with Roadrunner accounts are highly susceptible to the attack. Roadrunner accounts are those that have rr.com in their email addresses.

Online security experts said that Time Warner customers should change their passwords even if they were not prompted to do so.

This is not the first time that Time Warner faced a serious security issue. In 2009, an independent developer exposed some vulnerabilities into the cable company's computer system that could have affected at least 65,000 customers during that time.

Most recently, the company experienced some network outages before and during New Year's Day. IN November 2015, customers were also frustrated when Time Warner's network experienced serious outages.