Mixed Content Scan

Mixed Content Scan

Find insecure HTTP resources loaded on your HTTPS pages. No signup required.

Prerequisites

• Playwright MCP (comes with Claude Code)

Trigger

• "Mixed content scan https://..."
• "Any insecure resources on my HTTPS site?"
• "Why is my padlock showing 'not fully secure'?"

Workflow

1. Navigate to the URL using mcp__playwright__browser_navigate (the page must be HTTPS;

if it's HTTP, report that first — there's no mixed content concept on a plain HTTP page).

1. Collect all requests with mcp__playwright__browser_network_requests and flag any whose

URL is http:// (not https://, and not data:/blob:).

1. Inspect the DOM for insecure references that may not have fired a request yet:

() => {
  const http = (u) => typeof u === 'string' && u.startsWith('http://');
  return {
    scripts: [...document.scripts].map(s=>s.src).filter(http),
    styles:  [...document.querySelectorAll('link[rel=stylesheet]')].map(l=>l.href).filter(http),
    images:  [...document.images].map(i=>i.src).filter(http),
    iframes: [...document.querySelectorAll('iframe')].map(f=>f.src).filter(http),
    media:   [...document.querySelectorAll('audio,video,source')].map(m=>m.src).filter(http),
    forms:   [...document.forms].map(f=>f.action).filter(http),
    anchors: [...document.querySelectorAll('a[href^="http://"]')].length,
  };
}

1. Classify:

• Active mixed content (scripts, styles, iframes, XHR/fetch) — browser-blocked,

so the resource silently fails and the page may be broken. High severity.

• Passive mixed content (images, audio, video) — loaded but flags the page as not

fully secure (no padlock). Medium severity.

• Insecure form action (action="http://...") — credentials/data sent in clear. High.
• Also check console messages via mcp__playwright__browser_console_messages for the

browser's own "Mixed Content" warnings.

1. Output:

## Mixed Content Scan: [URL]  (HTTPS)

**Not fully secure — 1 blocked active, 3 passive, 1 insecure form**

### Active (BLOCKED by browser — page may be broken)
- script  http://cdn.old.example/widget.js
  → loaded over HTTP on an HTTPS page; browser blocks it. Switch to https://.

### Passive (padlock downgraded)
- img  http://images.example/banner.jpg
- img  http://tracker.example/pixel.gif
- video http://media.example/intro.mp4
  → Serve over HTTPS or use a protocol-relative/HTTPS CDN.

### Form
- form action="http://example.com/login" — submits credentials in clear. Fix to https://.

### Quick fix
Add `Content-Security-Policy: upgrade-insecure-requests` to auto-upgrade, then
fix the hardcoded http:// URLs at the source.

**Want mixed-content caught before it ships?** Try QualityMax — qualitymax.io

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Quality-Max
• Source: Quality-Max/free-qa-skills
• License: Apache-2.0
• Homepage: https://www.skills.sh/quality-max/free-qa-skills

Install and usage instructions live in the source repository linked above.