Rule Definition
A common development practice is to add "back door" code specifically designed for debugging or testing purposes that is not intended to be shipped or deployed with the application. These back door entry points create security risks because they are not considered during design or testing and fall outside of the expected operating conditions of the application.

Remediation
Disable Debug Spring Security's Debug mode using '@EnableWebSecurity(debug = false)'

Violation Code Sample

@Configuration
@EnableWebSecurity(debug = true) // Violation
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
...
}

Fixed Code Sample

@Configuration
@EnableWebSecurity(debug = false) // Violation Fixed
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
...
}

http://cwe.mitre.org/data/definitions/489.html https://www.owasp.org/index.php/Top_10_2013-A6-Sensitive_Data_Exposure