The US cybersecurity agency CISA is urging high-risk chemical facilities to secure their online accounts after someone accessed its Chemical Security Assessment Tool (CSAT) portal.

CSAT is used by industrial facilities that contain chemicals of interest, of which there are more than 300, in amounts at or above a certain threshold. These chemicals can be dangerous if they fall into the wrong hands and can be used for things like explosives and weapons.

Essentially, it is used to determine which facilities are considered high-risk under chemical facility anti-terrorism regulations.

Under normal circumstances, only facility members who have passed the chemical terrorism vulnerability information training and certification are allowed to access the portal.