In theory, thorough input/output sanitization could eliminate all vulnerabilities, making an application immune to unlawful manipulation.
However, complete sanitization usually isn’t a practical option, since most applications exist in a constant development state. Moreover, applications are also frequently integrated with each other to create an increasingly complex coded environment.
Web application security solutions and enforced security procedures, such as PCI Data Security Standard (PCI DSS) certification, should be deployed to avoid such threats.