Fixing XSS in Legacy PHP: Passing the Audit vs Solving the Problem
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The Challenges of legacy systems Legacy systems are not vulnerable by accident — they become vulnerable as a result of continuous evolution. The decisions made over time, often under pressure to deliver, gradually shape them into what they are today. These systems are rarely insecure because of a single flawed implementation. The root cause is almost always systemic. XSS is not a bug, it is a symptom of missing design decisions. A common characteristic of legacy systems is inconsiste