> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/web/xss/reflected-xss-in-a-javascript-string-with-html-encoded-angle-brackets.md).
# Reflected XSS in a JavaScript String with HTML-Encoded Angle Brackets
Reflected XSS in a JavaScript String with HTML-Encoded Angle Brackets notes for PortSwigger Web Security Academy labs, including exploitation workflow, payload testing, Burp Suite validation, and reme
### Reflected XSS Into a JavaScript String with Angle Brackets HTML Encoded
This lab contains a XSS-type vulnerability reflected in the search query tracking mechanism: the angle brackets (`<` and `>`) are encoded in HTML, but the reflected value is inserted inside a \*\* JavaScript string\*\*. The goal is to get out of this JS string and call `alert()`.
**Extract relevant to the code observed**
{% code overflow="wrap" %}
```javascript
var searchTerms = 'hello';
document.write('');
```
{% endcode %}
The search value (`searchTerms`) is concatenated in a `document.write` instruction inside a JavaScript-built HTML string. By injecting an apostrophe (`'`) into the value, you can close the current JavaScript string and execute arbitrary code.
```javascript
hello'
```
By sending the following string as a search value, you close the string, run `alert(0)` and then close:
```javascript
hello' ; alert(0);'
```
---
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+'){kind=tracking}
');
```
{% endcode %}
