Fast-food chain Chick-fil-A is warning customers after attackers hijacked loyalty accounts using stolen passwords in a credential stuffing attack.
Chick-fil-A says it detected suspicious login activity against some Chick-fil-A One accounts in June and launched an investigation. The company later concluded that unauthorized parties ran an automated credential stuffing attack against its website and mobile app between June 17 and June 19, 2026, using usernames and passwords obtained from previous data breaches or other third‑party sources. Chick-fil-A says it reset passwords and ended active sessions for affected accounts while investigating the incident.
Credential stuffing is an attack where criminals take username–password pairs stolen from one service and automatically try them on many other websites and apps to see where they still work. Because many people reuse passwords, attackers often gain access to accounts without ever breaking into the company’s systems in the traditional sense.
So, some may conclude that there are two sides to this. On the one hand, customers who reuse passwords across multiple sites make credential stuffing attacks much more likely to succeed. On the other, companies also have a responsibility to put protections in place to detect and block automated credential stuffing attacks before accounts are compromised.
How it works
To understand how it works, we’ve created a typical scenario:
- Cybercriminals obtain large lists of breached credentials from previous data breaches, dark web markets, or public dumps.
- They use automated tools to fire those credentials at login endpoints for popular services like retailers, banks, and loyalty programs.
- They take over accounts where the credentials still work, then siphon off stored value, personal data, or loyalty rewards, or resell the access to other criminals.
To a victim, this may seem like a breach at the company, but technically speaking, the cybercriminals already had the credentials and were able to enrich their database with additional information about the victims.
What do cybercriminals know about you?
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According to Chick-fil-A’s breach notifications, the attackers may have accessed a combination of:
- Name and email address.
- Chick-fil-A One membership number and mobile pay number.
- QR codes associated with the account.
- The balance of any Chick-fil-A credit, such as gift cards or rewards on the account.
- The last four digits of the stored credit or debit card number.
If you saved more details in your Chick-fil-A One account, attackers may also have seen:
- Birthdate (month and day).
- Phone number.
- Physical address.
Advice for Chick-fil-A customers
The real problem is that, over the years, we’ve designed and adopted a system that no longer works well for most people: passwords. We tell people not to reuse them and to use a password manager to keep track of unique passwords for every account. But for many people, password managers still seem complicated or untrustworthy. I’m afraid the same may turn out to be true for passkeys.
If you have or suspect you had a Chick-fil-A One account, you should act even if you haven’t received a letter.
- Set a new, unique password for your Chick-fil-A One account that you do not use anywhere else. And if you’ve used the same password elsewhere, change it on those accounts too.
- If you cannot log in because your account was locked or reset, follow Chick-fil-A’s recovery process.
- Turn on multi-factor authentication (MFA) if you haven’t already. Chick-fil-A supports MFA for Chick-fil-A One accounts using a verified mobile phone number.
- Be aware that attackers can use the exposed data to craft more convincing phishing messages and scams.
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