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This method is a band-aid patch when your downstream code is all messed up and you can’t fix it. Instead of treating the input string correctly, it just removes anything that might possibly trigger some vulnerability in wrong code.
The filter you’re using to avoid multiple encoding attacks creates multiple encoding attacks.
You should tell that to OWASP then, they wrote it. org.owasp.esapi 2.5.2.0, class is Encoder, method is canonicalize(String, bool, bool)
This method is a band-aid patch when your downstream code is all messed up and you can’t fix it. Instead of treating the input string correctly, it just removes anything that might possibly trigger some vulnerability in wrong code.