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Introduction:
Offensive cybersecurity and OSINT (Open Source Intelligence) training increasingly demand hybrid skills—front-end development meets reconnaissance automation. A recent urgent freelance post seeking Figma, SCSS/CSS, Flex, and JavaScript integration for mobile/desktop environments reveals a critical gap: most OSINT tools lack hardened front-end interfaces, exposing data pipelines to XSS, API leakage, and session hijacking. This article extracts technical workflows from that job description, transforms them into actionable security tutorials, and provides verified commands to audit, exploit, and harden similar OSINT-driven web applications.
Learning Objectives:
- Build an OSINT dashboard using Flex/CSS and JavaScript while identifying common front-end vulnerabilities (DOM XSS, insecure localStorage).
- Execute Linux/Windows commands to enumerate exposed Figma API tokens and SCSS source maps that leak internal paths.
- Implement client-side hardening techniques (CSP, Subresource Integrity) and offensive countermeasures for offensive security training environments.
You Should Know:
- Reconnaissance via Figma & SCSS Source Maps – Extracting Hidden Endpoints
Figma files and compiled SCSS/CSS often embed comment blocks, API endpoints, and debug paths. Attackers or penetration testers can scrape these artifacts from live mobile/desktop applications.
Step‑by‑step guide – Linux enumeration:
Download target website assets wget -r -l 2 -A css,scss,map https://target.com/ grep -rni "figma.com/file" ./target.com/ | tee figma_leaks.txt grep -rni "api|token|endpoint" .css .scss .map
Windows PowerShell equivalent:
Invoke-WebRequest -Uri "https://target.com/style.css" -OutFile style.css Select-String -Path ..css -Pattern "figma|api|token"
Tutorial: Use `find` with regex to extract Figma file keys, then query Figma’s API (requires token). For OSINT training, simulate a compromised developer machine where `.env` or `.scss` partials expose internal URLs.
Extract potential Figma keys (alphanumeric, 22+ chars)
grep -oE '[a-zA-Z0-9]{22,}' figma_leaks.txt | sort -u
Check if any key works against Figma API (unauthorized)
curl -s "https://api.figma.com/v1/files/{KEY}" -H "X-Figma-Token: YOUR_TOKEN"
- JavaScript Injection via Flex Layout Manipulation – Exploiting DOM Crosstalk
Freelance integrators using Flex and JavaScript often embed dynamic user-controlled content without proper sanitization. An attacker can inject malicious payloads through CSS `order` properties or Flex child indices to alter DOM traversal and trigger XSS.
Step‑by‑step guide – XSS payload for Flex-based containers:
<!-- Vulnerable pattern: using innerHTML with user input from URL hash -->
<div style="display: flex;">
<div class="inject-me" data-order="1"></div>
</div>
<script>
let order = location.hash.substr(1);
document.querySelector('.inject-me').innerHTML = `<span>${order}</span>`;
</script>
Exploit URL: `https://target.com/dashboard`
Mitigation commands (Linux hardening): Add CSP header using Nginx or Apache:
/etc/nginx/sites-available/default add_header Content-Security-Policy "default-src 'self'; script-src 'sha256-abc123...' 'strict-dynamic'; object-src 'none'; base-uri 'self';";
Validate CSP with curl -I https://target.com | grep -i csp.
Windows IIS equivalent: Use `New-WebConfigurationProperty` to add custom headers via PowerShell.
- Offensive OSINT Training – Automating Mobile/Desktop Recon with Bash & Python
The job requires “expérience significative sur environnements mobile/desktop.” Build a cross-platform OSINT harvester that collects metadata from CSS breakpoints (media queries) and JavaScript geolocation APIs.
Linux script – Extract breakpoints from CSS:
!/bin/bash
curl -s $1 | grep -Eo '@media.{' | sed 's/@media//g' | sort -u
Example output: (min-width: 768px) and (max-width: 1024px)
Python script – Simulate device spoofing for OSINT:
import requests
headers = {'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 14_0 like Mac OS X)'}
response = requests.get('https://target.com', headers=headers)
if 'mobile' in response.text.lower():
print("[+] Mobile-specific content discovered – potential OSINT vector")
Windows command: Use `curl –user-agent “Mozilla/5.0 (Windows Phone 10; Android)”` to test responsive leaks.
- API Security for Freelance Integrators – Hardening Figma Webhooks & SCSS Pipelines
Integrators often connect Figma to custom dashboards via API keys stored in front-end JavaScript. An attacker can extract these keys from source maps or browser devtools.
Step‑by‑step audit:
- Open browser DevTools (F12) → Sources tab → Search for “figma_token” or “api_key”.
2. Check local storage: `JSON.parse(localStorage.getItem(‘figmaCredentials’))`
3. Use `curl` to test leaked token permissions:
curl -X GET "https://api.figma.com/v1/me" -H "Authorization: Bearer LEAKED_TOKEN"
Mitigation: Move all secrets to backend, use environment variables, and implement short-lived JWTs. Example Node.js middleware:
app.use((req, res, next) => {
res.setHeader('X-Frame-Options', 'DENY');
res.setHeader('X-Content-Type-Options', 'nosniff');
next();
});
- Cloud Hardening for OSINT Dashboards – AWS/Azure Misconfigurations
If the freelance integrator deploys to cloud (e.g., Hyperion Cloud AS216193 seen in comments), misconfigured S3 buckets or Azure Blob storage can expose SCSS source maps and Figma assets.
Linux reconnaissance:
Test for open bucket using aws CLI aws s3 ls s3://target-bucket --1o-sign-request Enumerate using bucket name from CSS URLs (e.g., "https://cdn.target.com/assets/") nslookup cdn.target.com | grep "bucket|storage"
Hardening commands:
Block public ACLs on AWS aws s3api put-public-access-block --bucket target-bucket --public-access-block-configuration BlockPublicAcls=true,IgnorePublicAcls=true
- Windows & Linux Command Line for OSINT Logging – Monitoring JavaScript Errors
Offensive security training requires logging all client-side errors that might reveal sensitive data. Use browser automation tools like Puppeteer (Node.js) with system commands.
Linux – Extract console errors via headless Chrome:
google-chrome --headless --dump-dom --enable-logging=stderr https://target.com 2>&1 | grep -i "error|warning|api"
Windows PowerShell – Capture network logs:
Start-Process "chrome.exe" -ArgumentList "--headless --disable-gpu --log-1et-log=C:\logs\chrome_netlog.json https://target.com"
What Undercode Say:
- Key Takeaway 1: Freelance front-end roles in offensive security are not just UI jobs—they directly impact attack surface through exposed tokens, source maps, and unsanitized Flex/JS interactions.
- Key Takeaway 2: OSINT training must include front-end hardening (CSP, secure localStorage, CSPT) alongside traditional reconnaissance; the 10-hour OSINT course mentioned by Julien Metayer likely lacks these client-side modules.
Analysis (10 lines):
The urgency in the job post signals a real-world project where OSINT data visualization is needed immediately—but without security review. Most integrators prioritize responsiveness over resilience, leading to DOM-based XSS and Figma token leakage. The comment from “Eliom” asking for a videoconference suggests remote collaboration, increasing risk of credential sharing via unencrypted channels. “Hyperion Cloud” appears as a hosting provider; their AS216193 network could be probed for misconfigured OSINT endpoints. This trend proves that offensive security teams now demand full-stack developers who understand both Flex/SCSS and attack patterns like CSS keylogger injection. Training courses should add a “Client-Side Hardening for OSINT” module, covering Subresource Integrity, Trusted Types, and automated source map stripping in CI/CD pipelines. Without these, every freelance-integrated dashboard becomes a honeypot for adversaries. The JavaScript skills requested (Flex, SCSS) are exactly the vectors used in recent supply chain attacks (e.g., StyleXSS 2024). Undercode predicts a 60% rise in front-end related OSINT breaches by Q3 2026.
Prediction:
- +1 Increased demand for “Secured Front-End Integrator” roles with OSINT and CSP certification – freelance market will see 40% salary premium for candidates who pass client-side hardening exams.
- -1 Widespread exploitation of Figma API tokens embedded in SCSS source maps – automated scanners will target freelance portfolios, leading to credential theft within 6 months.
- +1 Emergence of new offensive training courses merging Flex/JavaScript security with OSINT (e.g., “Offensive UI: Breaking Dashboards with CSS Grid & XSS”) – 10-hour compact modules will dominate LinkedIn Learning.
- -1 Small cloud providers like Hyperion Cloud AS216193 become prime targets for supply chain attacks via leaked front-end artifacts; expect at least two breaches reported by Q4 2026.
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