> 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/zh/web/xss/stored-xss-in-onclick-with-full-encoding.md).
# onclick 中的存储型 XSS，完全编码
onclick 中的存储型 XSS，完全编码笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。
### 将存储型 XSS 注入 onclick 事件：尖括号和双引号经过 HTML 编码，单引号和反斜杠经过转义
此实验中在评论功能里存在一个存储型 XSS 漏洞：某个字段（姓名/作者/网站）的值会在一个 `onclick` 属性中并被编码—— `<` 和 `>` 尖括号和双引号会进行 HTML 编码，而单引号和反斜杠会被转义。
目的：提交一条评论以执行 `alert()` 当点击作者姓名时。
在 `网站` 区域中，页面会注入类似如下内容：
```javascript
onclick="var tracker={track(){}};tracker.track('http://test.com');"
```
单引号表示为 `'` 实体。例如：
```javascript
'
```
* 当 `HTTP://hack.com'test` 被发送到 `'` 页面时会作为撇号（因此该引号在 DOM 一侧存在）。
```javascript
* 当 `HTTP://hack.com'test` 被发送到 `'` 页面时会作为撇号（因此该引号在 DOM 一侧存在）。
* 利用这一事实 `'` 会变成撇号，从而打断 JavaScript 字符串，并注入一个计算/拼接表达式来调用 `alert()`.
```javascript
http://hack.com' + alert(0) + '
```
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