Nasdaq's website may be a ticking a time bomb for a major security breach, including a takeover by hackers, a cybersecurity expert warns.
Ilia Kolochenko, chief executive of Swiss information security company High-Tech Bridge, said he warned the exchange three weeks ago that Nasdaq.com had holes in its security. He said the weaknesses made it possible for hackers to steal users' browser histories and cookies or perform phishing attacks that could result in the theft of confidential data, according to the New York Daily News.
Kolochenko said his warnings have been ignored, although Nasdaq said the exchange responded to him on Sept. 4, the Daily News said.
"We take all information security matters seriously," a Nasdaq spokesman, said, according to the News. "We work with leading security vendors and have a trained and professional team that evaluates all credible threats across our digital assets."
(Read more: Nasdaq: 'Connectivity issue' led to three-hour shutdown)
Read the full report at the New York Daily News website.
—By CNBC's Cadie Thompson. Follow her on Twitter @CadieThompson.