Security vulnerabilities and automated fixes for localhost validation issues
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The boardroom server's `Handler` class, extending `SimpleHTTPRequestHandler`, exposed sensitive HTTP endpoints without any caller authentication. An attacker could exploit this by making cross-origin requests to internal ports through DNS rebinding, accessing `/alerts.json`, `/dismiss`, and `/events.js` without authorization. The fix adds `is_local_origin()` checks to both `do_GET()` and `do_POST()` methods.