Improper input validation

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String exploits are security exploits involving handling of string data in computer software.Hacking: the art of exploitation. No Starch Press Series. Safari Books Online. 2008. ISBN 9781593271442. {{cite book}}: Unknown parameter |Author= ignored (|author= suggested) (help); Unknown parameter |Edition= ignored (|edition= suggested) (help)

Format string attack - unchecked *printf format strings are dangerous
Buffer overflow - Buffer overflows often occurs in unsafe string functions
Cross-site scripting - unsafe output of input strings
Directory traversal - concatenating strings to create a filename is not a good idea
SQL injection - concatenating strings to create a SQL statement is not a good idea