The intrusion into Metropolitan Transportation Authority (MTA) systems in New York City Wednesday happened through a Pulse Secure zero day leveraged by Chinese threat actors. (MTA)

The intrusion into Metropolitan Transportation Authority (MTA) systems in New York City Wednesday happened through a Pulse Secure zero day leveraged by Chinese threat actors.

According to published reports, the MTA’s computer systems were penetrated in April, exposing vulnerabilities in the transportation network. A follow-up investigation by Mandiant found that the hackers did not gain access to the systems that control the trains, and MTA officials said rider safety was not at risk and the personal data of riders was not compromised.