Error validating users agent execution access

All sections should be reviewed The most common web application security weakness is the failure to properly validate input from the client or environment.

Data from the client should never be trusted for the client has every possibility to tamper with the data.

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Essentially, if you don't expect to see characters such as ?

Often the best approach is the simplest in terms of code.

The account select option is read directly and provided in a message back to the backend system without validating the account number if one of the accounts provided by the backend system.

One solution is to replace all non alphanumeric characters with an encoded version, so "I like your web page", might emerge from your sanitation routines as "I like your web page! (This example uses URL encoding.) You can also go one step further.

Say you want to set up a site where users can upload arbitrary files so they can share them or download them again from another location.

This is not to say that the entire set of business rules need be applied - it means that the fundamentals are performed to prevent unnecessary round trips to the backend and to prevent the backend from receiving most tampered data.

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