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Please look at the OWASP Java Encoder JavaScript encoding examples for examples of proper JavaScript use that requires minimal encoding. For JSON, verify that the Content-Type header is application/json and not text/html to prevent XSS.
Please look at the OWASP Java Encoder JavaScript encoding examples for examples of proper JavaScript use that requires minimal encoding. For JSON, verify that the Content-Type header is application/json and not text/html to prevent XSS.
Directly setting event handler attributes will allow JavaScript encoding to mitigate against DOM based XSS. Please note, it is always dangerous design to put untrusted data directly into a command execution context.
This cross-site scripting (XSS) cheat sheet contains many vectors that can help you bypass WAFs and filters. You can select vectors by the event, tag or browser and a proof of concept is included for every vector. You can download a PDF version of the XSS cheat sheet. This is a PortSwigger Research project.
14 mar 2013 · If you're using MS ASP.NET, you can use their Anti-XSS Library, which provides all of the necessary context-encoding methods. Note that all encoding should not be restricted to user input, but also stored values from the database, text files, etc.
This cheat sheet demonstrates that input filtering is an incomplete defense for XSS by supplying testers with a series of XSS attacks that can bypass certain XSS defensive filters. Basic XSS Test Without Filter Evasion¶.
How to prevent XSS client-side in JavaScript. To escape user input in an HTML context in JavaScript, you need your own HTML encoder because JavaScript doesn't provide an API to encode HTML. Here is some example JavaScript code that converts a string to HTML entities:
