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dom-clobbering

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DOM clobbering — abuse named HTML elements to overwrite JavaScript global variables, bypass CSP, hijack object property lookups.

packages/decepticon/decepticon/skills/standard/exploit/web/dom-clobbering/SKILL.md

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# DOM Clobbering

Named HTML elements (`<form>`, `<a>`, `<input>`, `<img>`) with `name=`
or `id=` are accessible as JavaScript properties of `window` and `document`.
If app code does `if (window.config.endpoint)` and attacker can inject
HTML (even sanitized), they can replace `window.config` with an HTML
element.

## 1. The classic
```html
<!-- App code -->
<script>
if (window.config && window.config.endpoint) {
    fetch(window.config.endpoint + '/data');