Application security is crucial as the number and complexity of applications rise, ensuring their security to deliver a great user experience and business growth. Application security vulnerabilities are soft spots in software that unwanted intruders search for, which can lead to unauthorized access, modification of app functionalities, theft of sensitive data, or complete app shutdown. Common application security vulnerabilities include injection attacks, broken authentication, sensitive data exposure, XML external entities, broken access control, security misconfigurations, cross-site scripting, insecure deserialization, using components with known vulnerabilities, and insufficient logging and monitoring. To address these vulnerabilities, it's essential to have a robust security foundation through methodical evaluation and consistent action, such as drafting a security policy, cataloging assets, embracing automated vulnerability scanning, engaging in annual code review, conducting penetration testing, threat modeling, patch management, nurturing developers, establishing a feedback system, instituting a bug bounty program, prioritizing monitoring and logging, and having a battle-ready incident response plan. New Relic IAST offers continuous, real-time security feedback to empower teams to catch, address, and verify vulnerabilities swiftly and efficiently.