>> Just recently I did the #1 mistake
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Top 25 Most Dangerous Programming Mistakes
1. Improper Input Validation
Ensure that your input is valid. If you're expecting a number, it shouldn't contain letters. Nor should the price of a new car be allowed to be a dollar. Incorrect input validation can lead to vulnerabilities when attackers can modify their inputs in unexpected ways. Many of today's most common vulnerabilities can be eliminated, or at least reduced, with strict input validation.
2. Improper Encoding or Escaping of Output
Insufficient output encoding is at the root of most injection-based attacks. An attacker can modify the commands that you intend to send to other components, possibly leading to a complete compromise of your application - not to mention exposing the other components to exploits that the attacker would not be able to launch directly. When your program generates outputs to other components in the form of structured messages such as queries or requests, be sure to separate control information and metadata from the actual data.
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