> 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-vulnerabilities/sql-truncation-attack/sql-truncation-registration-pentesting-web.md).
# SQL 截断注册
## SQL 截断：
这是 **电子邮件地址列表** 我们应该尝试访问：
在注册面板中，如果我们尝试 **插入** 一个电子邮件地址，这表明该用户已存在：
我们在 HTML 代码中看到 **数据库** 将字符数限制为 13：
我们输入带有空格和一个额外字符的电子邮件地址，同时也修改 **maxlength** HTML 代码中的值为更大的数，以允许我们输入：
我们成功 **注册** 使用用户名 Jacob，因为发生的情况是，电子邮件已被 **截断**。这就是我们所说的字符串末尾空格截断，即自动删除这些空格。
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