What is Cross-Site Scripting (XSS)?

XSS is a web security vulnerability where attackers inject malicious scripts into pages viewed by other users, potentially stealing data or performing unauthorized actions.

How does the tool detect XSS payloads?

It uses pattern matching to identify common XSS vectors like script tags, event handlers, and encoded strings, based on the selected analysis options.

Can I customize the detection checks?

Yes, you can enable or disable specific checks for event handlers, script tags, protocols, encoded payloads, and more using the provided options.

What risk levels does the tool assign?

Risk levels range from LOW for basic HTML tags to CRITICAL for complete, executable XSS payloads, helping prioritize security responses.

Is this tool suitable for real-time protection?

It's designed for testing and analysis. For real-time protection, integrate with web application firewalls or security libraries.

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XSS Payload Detector

Detect XSS (Cross-Site Scripting) attack vectors in input strings

Details

What this tool helps you do

XSS Payload Detector

This tool helps identify potential XSS vulnerabilities in your input:

Detection Categories:

Script Tags: <script>, </script>, <script.*?>
Event Handlers: onclick, onload, onerror, onmouseover, etc.
Dangerous Protocols: javascript:, vbscript:, data:
iframe/frame: <iframe>, <frame>
Object/Embed: <object>, <embed>
Style Injection: <style>, expression(), -moz-binding
SVG-based XSS: <svg> tags with event handlers
DOM-based XSS: innerHTML, eval(), document.write()

Risk Levels:

LOW: Basic HTML tags without scripts
MEDIUM: Event handlers and protocols
HIGH: Script tags and encoded payloads
CRITICAL: Complete, executable XSS payloads

Example Attack Patterns:

<script>alert('XSS')</script>
<img src=x onerror=alert('XSS')>
<svg onload=alert('XSS')>
javascript:alert('XSS')
<iframe src="javascript:alert('XSS')">
%3Cscript%3Ealert('XSS')%3C/script%3E

Use Cases:

Validate user input before rendering
Scan log files for XSS attempts
Review code for potential vulnerabilities
Security testing and penetration testing
Educational tool for learning XSS attacks

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Inputs

Set the required fields, then run the tool.

7 options

ContentPaste or type the main input values.1

Text to AnalyzetextareaRequired

SettingsAdjust formats, ranges, numbers, and modes.1

Maximum Analysis DepthnumberOptionalMaximum depth for nested pattern analysis

TogglesEnable or disable optional behavior.5

Check Event HandlerscheckboxOptionalEnabled when checkedDetect onclick, onload, onerror, and other event handlersCheck Script TagscheckboxOptionalEnabled when checkedDetect <script> tags and related patternsCheck Dangerous ProtocolscheckboxOptionalEnabled when checkedDetect javascript:, vbscript:, data: protocolsCheck Encoded PayloadscheckboxOptionalEnabled when checkedDetect URL-encoded and HTML entity-encoded attacksDecode and AnalyzecheckboxOptionalEnabled when checkedDecode HTML entities and URL encoding before analysis

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

XSS Payload Detector

What this tool helps you do

XSS Payload Detector

Run this tool

Inputs

Result

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Inputs

Result

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Detecting Script Tag Injection in User Comments

2. Scanning Encoded XSS Payloads in Logs

FAQ

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