Security vulnerabilities and automated fixes for microworlds issues
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A critical Server-Side Request Forgery (SSRF) vulnerability was discovered in `libraries/microworlds/video.js` where the `VideoCanvasWrapper.loadVideo()` function passed user-controlled URLs directly to `fetch()` without any validation. An attacker could exploit this by supplying URLs pointing to internal services, localhost endpoints, or malicious external servers. The fix introduces strict URL parsing and protocol validation before any network request is made.