This is the 10487th most frequent Russian word.
взломан
"Hacked."
The word 'взломан' in this sentence expresses a possibility, indicating what might happen under certain conditions.
Без соответствующих мер защиты, сайт может быть взломан.
Without proper security measures, the website can be hacked.
In this context, 'взломан' details a completed action discovered later (the safe being forcibly opened).
Сейф оказался взломан профессиональным вором.
The safe was found to have been broken into by a professional thief.
The word 'взломан' here is used in the past participle, passive form to describe an event (the account being hacked).