CB INDIGO on your credit report refers to the Indigo Platinum Mastercard, issued by Celtic Bank. CB stands for Celtic Bank, while INDIGO refers to Indigo Card.
Seeing CB INDIGO on your credit report is nothing to worry about if you have the Indigo Credit Card or you recently applied for it.
If you do not have the Indigo Card and did not recently apply for it, you should file a dispute with the credit bureau that produced the credit report containing CB INDIGO. It's also a good idea to check your other credit reports and take additional steps to protect yourself against fraud.