Hackers with possible links to Iran appear to have breached an unprotected human-machine interface system at an Israeli water reservoir that connected directly to the internet and lacked security protocols, according to industrial cybersecurity firm Otorio.

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The security firm reports that the alleged Iranian hacking group, referred to as “Unidentified TEAM,” published a video of the attack on an unnamed reclaimed Israeli water reservoir human-machine interface (HMI) system, which did not require any authentication to access and modify the system. This allowed the threat actors to tamper with the water pressure, change temperatures and more.