Credential Stuffing Attack Exposes Data of Jason’s Deli Customers

Popular US-based restaurant chain Jason’s Deli informed the customers registered with its online platform that their personal data might have been exposed in a data security incident.

According to the notification letter sent to customers and submitted to the Maine Attorney General’s Office, the incident was first discovered on December 21, 2023. The restaurant chain said that unknown hackers obtained credentials from data breach incidents unrelated to Jason’s Deli and used them to access its reward and online accounts.

“On December 21, 2023, we learned that an unauthorized party had obtained an unknown number of Deli Dollar and online account login credentials (usernames and passwords) most likely from other data breaches or other sources not involving Jason’s Deli,” the notice read.

According to the list submitted by the company, nearly 344,000 individuals were affected by this credential stuffing attack, and the personal information compromised may include:

• Name
• Address (all saved delivery address)
• Phone number
• Birthday
• Contact list
• House account number
• Deli Dollars points
• Truncated gift card/credit card numbers (last 4 digits)

Despite the type of information compromised, Jason’s believes that the attack can only be effective if the said users have reused the same credentials across multiple online platforms. Thus, making their Deli accounts susceptible to online hacking.

Jason’s Deli also revealed that although the incident was discovered, it was unable to confirm the number of accounts affected. “We do not know the number of accounts that the unauthorized party was able to access, but out of an abundance of caution, we are sending this notice to all potentially affected account holders,” it confirmed in the notification.

In addition to bolstering its data security, the company will also be restoring balances of impacted customers’ Deli Dollars account (wherever applicable). Customers are also advised to change their usernames and create complex passwords for Deli and other online accounts.

With more than 250 restaurants, Jason’s Deli is an American family-owned restaurant chain, employing over 6,000 employees across the US.