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Build a Web Application Vulnerability Scanner

Develop a tool that scans web applications for common vulnerabilities like SQL injection, XSS, and security misconfigurations — a powerful cybersecurity utility for ethical hackers and developers.

Why Build a Vulnerability Scanner?

Modern web apps often suffer from security flaws that leave them open to attacks. Manual testing is time-consuming and error-prone. An automated vulnerability scanner can quickly identify flaws like injection attacks, broken authentication, and insecure headers — helping developers and security teams take fast action.

Core Features of the Tool

This scanner takes a target URL and analyzes the web application for common vulnerabilities. It simulates attacks like SQL injection and cross-site scripting, checks for outdated libraries, and inspects HTTP headers and cookies. The results are summarized in a detailed report for remediation.

Key Features to Implement

SQL Injection & XSS Detection

Send payloads to detect potential input validation flaws in forms and URL parameters.

Security Header Analysis

Check for missing or misconfigured headers like CSP, HSTS, X-Frame-Options.

Cookie Security Inspection

Analyze cookies for secure, HttpOnly, and SameSite attributes.

PDF Vulnerability Report

Generate a downloadable report listing all vulnerabilities and recommended fixes.

How the Scanner Works

Users input a web application's base URL. The tool crawls pages, identifies inputs and scripts, and runs simulated attack payloads against them. It then analyzes the server’s responses and behavior to detect vulnerabilities and summarizes them for reporting.

  • Input a target web application's URL.
  • Tool crawls and maps the site structure, detecting input fields and forms.
  • Runs payloads to test for vulnerabilities like SQL injection or XSS.
  • Scans HTTP headers and cookies for security best practices.
  • Displays results in a dashboard or exports a report as PDF/CSV.
Recommended Tech Stack

Frontend

React.js or Next.js for the dashboard UI and scan submission form.

Backend

Python Flask or FastAPI to handle scanning logic and vulnerability analysis.

Scanning Engine

Use libraries like Requests, BeautifulSoup, or Selenium for crawling and payload injection.

Reporting

ReportLab or WeasyPrint to generate professional PDF reports.

Step-by-Step Build Plan

1. Input & Crawler Setup

Build input form for URL and crawler to scan internal pages and forms.

2. Simulate Attacks

Send attack payloads to test for injection, XSS, and header misconfigurations.

3. Analyze and Categorize Vulnerabilities

Parse server responses and categorize risks based on severity.

4. Dashboard UI & Reports

Display results in an admin panel and enable exporting reports.

5. Optional Authentication Scanner

Add support to scan authenticated sections using login credentials or session cookies.

Helpful Resources for Development

Scan and Secure Web Applications Automatically

Build a tool that empowers developers and security professionals to proactively find and fix vulnerabilities in web applications.

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