A significant data theft at Orange Belgium has opened hundreds of thousands of its customers to serious cybersecurity risks.

The telecom company confirmed that data pertaining to 850,000 customer accounts was compromised during an intrusion at the end of July, with the attacker gaining access to sensitive information.

The crooks accessed the full names and phone numbers of subscribers, Orange said on Wednesday. Perhaps even more concerning, the attackers got SIM card numbers and personal unlocking key (PUK) codes.

This data could potentially prove to be a goldmine for criminals, experts told The Register , with customers now susceptible to targeted phishing and fraud campaigns.

David Rogers MBE, CEO at Windsor-based security company Copper Horse, said: "The association between the SIM

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