Federal investigators found significant cybersecurity weaknesses in the health insurance websites of California, Kentucky and Vermont that could enable hackers to get their hands on sensitive personal information about hundreds of thousands of people, The Associated Press has learned. And some of those flaws have yet to be fixed. The vulnerabilities were discovered by the Government Accountability Office and shared with state officials last September. Vermont authorities would not discuss the findings, but officials in California and Kentucky said this week that there was no evidence hackers succeeded in stealing anything.