Capacitor Security with Capsec

Zero-config security scanning for Capacitor and Ionic apps.

When to Use This Skill

• User wants to secure their app
• User asks about security vulnerabilities
• User needs to run security audit
• User has hardcoded secrets
• User needs CI/CD security scanning
• User asks about OWASP mobile security

Quick Start with Capsec

Run Security Scan

# Scan current directory (no installation needed)
bunx capsec scan

# Scan specific path
bunx capsec scan ./my-app

# CI mode (exit code 1 on high/critical issues)
bunx capsec scan --ci

Output Formats

# CLI output (default)
bunx capsec scan

# JSON report
bunx capsec scan --output json --output-file report.json

# HTML report
bunx capsec scan --output html --output-file security-report.html

Filtering

# Only critical and high severity
bunx capsec scan --severity high

# Specific categories
bunx capsec scan --categories secrets,network,storage

# Exclude test files
bunx capsec scan --exclude "**/test/**,**/*.spec.ts"

Security Rules Reference

Secrets Detection (SEC)

Rule	Severity	Description
SEC001	Critical	Hardcoded API Keys & Secrets
SEC002	High	Exposed .env File

What Capsec Detects:

• AWS Access Keys
• Google API Keys
• Firebase Keys
• Stripe Keys
• GitHub Tokens
• JWT Secrets
• Database Credentials
• 30+ secret patterns

Fix Example:

// BAD - Hardcoded API key
const API_KEY = 'sk_live_abc123xyz';

// GOOD - Use environment variables
import { Env } from '@capgo/capacitor-env';
const API_KEY = await Env.get({ key: 'API_KEY' });

Storage Security (STO)

Rule	Severity	Description
STO001	High	Unencrypted Sensitive Data in Preferences
STO002	High	localStorage Usage for Sensitive Data
STO003	Medium	SQLite Database Without Encryption
STO004	Medium	Filesystem Storage of Sensitive Data
STO005	Low	Insecure Data Caching
STO006	High	Keychain/Keystore Not Used for Credentials

Fix Example:

// BAD - Plain preferences for tokens
import { Preferences } from '@capacitor/preferences';
await Preferences.set({ key: 'auth_token', value: token });

// GOOD - Use secure storage
import { NativeBiometric } from '@capgo/capacitor-native-biometric';
await NativeBiometric.setCredentials({
  username: email,
  password: token,
  server: 'api.myapp.com',
});

Network Security (NET)

Rule	Severity	Description
NET001	Critical	HTTP Cleartext Traffic
NET002	High	SSL/TLS Certificate Pinning Missing
NET003	High	Capacitor Server Cleartext Enabled
NET004	Medium	Insecure WebSocket Connection
NET005	Medium	CORS Wildcard Configuration
NET006	Medium	Insecure Deep Link Validation
NET007	Low	Capacitor HTTP Plugin Misuse
NET008	High	Sensitive Data in URL Parameters

Fix Example:

// BAD - HTTP in production
const config: CapacitorConfig = {
  server: {
    cleartext: true,  // Never in production!
  },
};

// GOOD - HTTPS only
const config: CapacitorConfig = {
  server: {
    cleartext: false,
    // Only allow specific domains
    allowNavigation: ['https://api.myapp.com'],
  },
};

Capacitor-Specific (CAP)

Rule	Severity	Description
CAP001	High	WebView Debug Mode Enabled
CAP002	Medium	Insecure Plugin Configuration
CAP003	Low	Verbose Logging in Production
CAP004	High	Insecure allowNavigation
CAP005	Critical	Native Bridge Exposure
CAP006	Critical	Eval Usage with User Input
CAP007	Medium	Missing Root/Jailbreak Detection
CAP008	Low	Insecure Plugin Import
CAP009	Medium	Live Update Security
CAP010	High	Insecure postMessage Handler

Fix Example:

// BAD - Debug mode in production
const config: CapacitorConfig = {
  ios: {
    webContentsDebuggingEnabled: true,  // Remove in production!
  },
  android: {
    webContentsDebuggingEnabled: true,  // Remove in production!
  },
};

// GOOD - Only in development
const config: CapacitorConfig = {
  ios: {
    webContentsDebuggingEnabled: process.env.NODE_ENV === 'development',
  },
};

Android Security (AND)

Rule	Severity	Description
AND001	High	Android Cleartext Traffic Allowed
AND002	Medium	Android Debug Mode Enabled
AND003	Medium	Insecure Android Permissions
AND004	Low	Android Backup Allowed
AND005	High	Exported Components Without Permission
AND006	Medium	WebView JavaScript Enabled Without Safeguards
AND007	Critical	Insecure WebView addJavascriptInterface
AND008	Critical	Hardcoded Signing Key

Fix AndroidManifest.xml:

<!-- BAD -->
<application android:usesCleartextTraffic="true">

<!-- GOOD -->
<application
    android:usesCleartextTraffic="false"
    android:allowBackup="false"
    android:networkSecurityConfig="@xml/network_security_config">

network_security_config.xml:

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="false">
        <domain includeSubdomains="true">api.myapp.com</domain>
        <pin-set>
            <pin digest="SHA-256">your-pin-hash</pin>
        </pin-set>
    </domain-config>
</network-security-config>

iOS Security (IOS)

Rule	Severity	Description
IOS001	High	App Transport Security Disabled
IOS002	Medium	Insecure Keychain Access
IOS003	Medium	URL Scheme Without Validation
IOS004	Low	iOS Pasteboard Sensitive Data
IOS005	Medium	Insecure iOS Entitlements
IOS006	Low	Background App Refresh Data Exposure
IOS007	Medium	Missing iOS Jailbreak Detection
IOS008	Low	Screenshots Not Disabled for Sensitive Screens

Fix Info.plist:

<!-- BAD - Disables ATS -->
<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

<!-- GOOD - Specific exceptions only -->
<key>NSAppTransportSecurity</key>
<dict>
    <key>NSExceptionDomains</key>
    <dict>
        <key>legacy-api.example.com</key>
        <dict>
            <key>NSExceptionAllowsInsecureHTTPLoads</key>
            <true/>
            <key>NSExceptionMinimumTLSVersion</key>
            <string>TLSv1.2</string>
        </dict>
    </dict>
</dict>

Authentication (AUTH)

Rule	Severity	Description
AUTH001	Critical	Weak JWT Validation
AUTH002	High	Insecure Biometric Implementation
AUTH003	High	Weak Random Number Generation
AUTH004	Medium	Missing Session Timeout
AUTH005	High	OAuth State Parameter Missing
AUTH006	Critical	Hardcoded Credentials in Auth

Fix Example:

// BAD - No JWT validation
const decoded = jwt.decode(token);

// GOOD - Verify JWT signature
const decoded = jwt.verify(token, publicKey, {
  algorithms: ['RS256'],
  issuer: 'https://auth.myapp.com',
  audience: 'myapp',
});

WebView Security (WEB)

Rule	Severity	Description
WEB001	Critical	WebView JavaScript Injection
WEB002	Medium	Unsafe iframe Configuration
WEB003	Medium	External Script Loading
WEB004	Medium	Content Security Policy Missing
WEB005	Low	Target _blank Without noopener

Fix - Add CSP:

<!-- index.html -->
<meta http-equiv="Content-Security-Policy" content="
  default-src 'self';
  script-src 'self';
  style-src 'self' 'unsafe-inline';
  img-src 'self' data: https:;
  connect-src 'self' https://api.myapp.com;
  font-src 'self';
  frame-ancestors 'none';
">

Cryptography (CRY)

Rule	Severity	Description
CRY001	Critical	Weak Cryptographic Algorithm
CRY002	Critical	Hardcoded Encryption Key
CRY003	High	Insecure Random IV Generation
CRY004	High	Weak Password Hashing

Fix Example:

// BAD - Weak algorithm
const encrypted = CryptoJS.DES.encrypt(data, key);

// GOOD - Strong algorithm
const encrypted = CryptoJS.AES.encrypt(data, key, {
  mode: CryptoJS.mode.GCM,
  padding: CryptoJS.pad.Pkcs7,
});

// BAD - Hardcoded key
const key = 'my-secret-key-123';

// GOOD - Derived key
const key = await crypto.subtle.deriveKey(
  { name: 'PBKDF2', salt, iterations: 100000, hash: 'SHA-256' },
  baseKey,
  { name: 'AES-GCM', length: 256 },
  false,
  ['encrypt', 'decrypt']
);

Logging (LOG)

Rule	Severity	Description
LOG001	High	Sensitive Data in Console Logs
LOG002	Low	Console Logs in Production

Fix Example:

// BAD - Logging sensitive data
console.log('User password:', password);
console.log('Token:', authToken);

// GOOD - Redact sensitive data
console.log('User authenticated:', userId);
// Use conditional logging
if (process.env.NODE_ENV === 'development') {
  console.debug('Debug info:', data);
}

CI/CD Integration

GitHub Actions

name: Security Scan

on: [push, pull_request]

jobs:
  security:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: oven-sh/setup-bun@v1

      - name: Run Capsec Security Scan
        run: bunx capsec scan --ci --output json --output-file security-report.json

      - name: Upload Security Report
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: security-report
          path: security-report.json

GitLab CI

security-scan:
  image: oven/bun:latest
  script:
    - bunx capsec scan --ci
  artifacts:
    reports:
      security: security-report.json
  only:
    - merge_requests
    - main

Configuration

capsec.config.json

{
  "exclude": [
    "**/node_modules/**",
    "**/dist/**",
    "**/*.test.ts",
    "**/*.spec.ts"
  ],
  "severity": "low",
  "categories": [],
  "rules": {
    "LOG002": {
      "enabled": false
    },
    "SEC001": {
      "severity": "critical"
    }
  }
}

Initialize Config

bunx capsec init

Root/Jailbreak Detection

import { IsRoot } from '@capgo/capacitor-is-root';

async function checkDeviceSecurity() {
  const { isRooted } = await IsRoot.isRooted();

  if (isRooted) {
    // Option 1: Warn user
    showWarning('Device security compromised');

    // Option 2: Restrict features
    disableSensitiveFeatures();

    // Option 3: Block app (for high-security apps)
    blockApp();
  }
}

Security Checklist

Before Release

• [ ] Run bunx capsec scan --severity high
• [ ] Remove all console.log statements
• [ ] Disable WebView debugging
• [ ] Remove development URLs
• [ ] Verify no hardcoded secrets
• [ ] Enable certificate pinning
• [ ] Implement root/jailbreak detection
• [ ] Add Content Security Policy
• [ ] Use secure storage for credentials
• [ ] Enable ProGuard (Android)
• [ ] Verify ATS settings (iOS)

Ongoing

• [ ] Run security scans in CI/CD
• [ ] Monitor for new vulnerabilities
• [ ] Update dependencies regularly
• [ ] Review third-party plugins
• [ ] Audit authentication flows

Resources

• Capsec Documentation: https://capacitor-sec.dev
• OWASP Mobile Top 10: https://owasp.org/www-project-mobile-top-10
• OWASP MASTG: https://mas.owasp.org/MASTG
• Capgo Security Plugins: https://capgo.app