Description
The response contains one or more credit card numbers. The credit card numbers were validated using the Luhn algorithm to make sure they are real credit card numbers.
Remediation
It's recommended that sensitive data such as credit card numbers or social security numbers should not be exposed on your website.
References
Related Vulnerabilities
[Possible] WS_FTP Log File Detected
WordPress Plugin WP Support Plus Responsive Ticket System Multiple Vulnerabilities (4.1)
WordPress Plugin Credova_Financial Information Disclosure (1.4.8)
SAP Management Console list logfiles
phpMyAdmin Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2016-9855)