<p>标签内尖括号被过滤且无法通过单双引号逃逸时的合法XSS测试解决方案咨询

Hey there! Let's walk through what's going on with your XSS test and explore actionable steps to move forward—all within ethical, authorized testing boundaries, of course.

First, Let's Break Down the Core Issues #

From your details, two main roadblocks are stopping your test:

1. 404 Error: Appending the <script> tag directly to the URL path makes the server think you're requesting a non-existent resource. Most servers treat the URL path as a file/directory location, so random script code here will always trigger a "page not found" error.
2. HTML Escaping: The site is converting special characters like < and > to their HTML entity equivalents (< and >). This means your script tag gets rendered as plain text, not executable code—even when you try escaping with single or double quotes.

Fixes & Workarounds to Try #

1. Shift to Query Parameters (Not URL Path)

Instead of tacking your test code onto the URL path, target pages with query parameters (the part after ?). For example:

• Skip: https://www.###.com/###/<script>alert('XSS')</script>
• Try: https://www.###.com/###?search=<script>alert('XSS')</script>

Query parameters are built for user input, so they're far more likely to be processed and rendered in the page without triggering a 404.

2. Bypass Escaping with Non-Script XSS Vectors

Since the site is blocking <script> tags via escaping, try alternative payloads that don't rely on explicit script tags:

• Event handlers: If your input ends up inside an HTML element (like a div or span), use payloads like onmouseover=alert('XSS') (you'll need to hover over the text to trigger the alert).
• URL-encoded payloads: Try encoding your script code to see if the server decodes it before rendering. For example:

  %3Cscript%3Ealert('XSS')%3C/script%3E
  

• Attribute injection: If your input is used in an HTML attribute (e.g., <input value="YOUR_INPUT">), try a payload like " onfocus=alert('XSS') autofocus " to break out of the attribute and trigger an event.

3. Check Where Your Input Is Rendered

Right now, your input is showing up inside a <p> tag's text content. Even without escaping, browsers treat text inside <p> as plain text—they won't parse it as HTML. For your payload to execute, it needs to be inserted into:

• An HTML attribute (like class, href, or value)
• Directly into the page's HTML structure (not wrapped in a text node)

Keep an eye out for these contexts as you test.

4. Double-Check Authorization

A quick critical reminder: Make sure you have explicit written permission to test this site. Ethical hacking requires clear authorization to avoid legal or ethical missteps.

内容的提问来源于stack exchange，提问作者NOTFLIKS