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“Input validation is not a great solution for [web application] injection attacks. First, input…”

““Input validation is not a great solution for [web application] injection attacks. First, input validation is typically done when the data is received, before the destination is known. That means that we don’t know which characters might be significant in the target interpreter. Second, […] applications must allow potentially harmful characters in. For example, should poor Mr. O’Malley be prevented from registering in the database simply because SQL considers ’ a special character?””

An excerpt from XSS (Cross Site Scripting) Prevention Cheat Sheet by Jeff Williams and Jim Manico

View full post on Lenny Zeltser on Information Security

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