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Imagine trying to authenticate a user nameed "Foo'or True Or'foo" — no "dangerous" characters, but there goes your login scheme.If all you're doing is reading and writing to the db, then properly parameterizing queries should take care of the problem.And that change is initiated by the value itself as it contains particular character sequences that mark the end of the one and the start of the other context.
However, this article has a section on filtering that is a starting point if you want to go that route.Although this seems like a trivial question, I am quite sure it is not :) I need to validate names and surnames of people from all over the world. If it were only English ones I think that this would cut it: I doubt that this is feasible - there are just to much Unicode symbols to exclude all unwanted symbols (and how will tell you what Chinese symbols to exclude?) and there are surly to many valid symbols to inlcude them all (and you will have Chinese symbols problem again).you allow the users to put whatever they want in the field, since names are crazy and there are a lot of unicode characters in the world, then you treat whatever anyone puts in that field like its radioactive.Sanitize the inputs and let them enter whatever they want for a name, because deciding what is a valid name and what is not is probably way outside the scope of whatever you're doing; given the range of potential strange - and legal names is nearly infinite.
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If you want to use user input in a SQL string declaration, escape the SQL string meta characters. Well it seem’s that you didn’t understand what XSS exactly is or what its fundamental flaw is.