Seibu Railway: it detected unauthorized access to its line information site GRUTTO PLUS, took the site offline, and reopened it about a year later with stronger security

Seibu Railway announced that it had detected unauthorized access from outside to its site GRUTTO PLUS, which covers areas along the Seibu lines. It said it would suspend the site for the time being and carry out maintenance. [1] [2] [4]

The company published the result of a third-party investigation. No trace of an intrusion or compromise from outside was found, and no customers had reported damage. [4]

The company reopened the site in a renewed form with stronger security and regular monitoring. It took 351 days from the announcement of the suspension to the reopening. [3] [4]