The FBI is investigating a cyberattack on its jobs portal after the cybercrime group ShinyHunters said it hacked the system and stole a vast trove of sensitive data from the bureau.

ShinyHunters told 404 Media that it hacked into the jobs portal using a zero-day vulnerability in Oracle’s PeopleSoft human-resources platform, a tactic it has used before.

Foreign governments could also use FBI employees’ personal data to monitor them and undermine their investigations and operations.

The FBI’s jobs portal is currently offline and displays a banner explaining that the site is unavailable.

Kaiser pointed to a 2016 breach that led to the theft of personal information belonging to tens of thousands of FBI employees.