A code vulnerability is a weakness in software logic or implementation that an attacker can abuse to break security or integrity. It may come from unsafe input handling, broken authentication, memory errors, race conditions, or incorrect authorization checks. Even small flaws can create a path to data theft, privilege escalation, remote code execution, or service disruption.
Code vulnerabilities matter because they are often the entry point for real attacks and a major focus of defense. Security teams look for them with code review, static analysis, fuzzing, dependency scanning, and secure design checks. In modern workflows, AI assistants and security plugins may help surface suspicious patterns earlier, but their findings still need human validation. Treating vulnerabilities as part of everyday development supports shift-left security: finding and fixing issues before software is deployed.