If when I evaluate the security readiness of a web server I find an issue in the code that might allow an SQL injection attack, what InfoSec term describes this development?

Vulnerability

Explanation:

Vulnerability is a cyber-security term that refers to a flaw in a system that can leave it open to attack. A vulnerability may also refer to any type of weakness in a computer system itself, in a set of procedures, or in anything that leaves information security exposed to a threat. Vulnerabilities are what information security and information assurance professionals seek to reduce. Cutting down vulnerabilities provides fewer options for malicious users to gain access to secure information.

yes, but you must first make sure that you'll be able to make your turn or you can crash into other vehicles.