CVE-2026-63642: MagicMirror newsfeed Socket.IO notification allows blind server-side request forgery

The checkArticleUrl() function in newsfeed/node_helper.js runs fetch(url, { method: "HEAD" }) with zero validation of the URL and returns ARTICLE_URL_STATUS { url, canFrame }.

This gives the attacker a boolean + timing oracle to map internal hosts and ports: presence, absence, and response time reveal which internal services are alive. It is a “blind-ish” SSRF — the attacker doesn’t see the body, but forces the server-side request and observes the effect on the target.

The actual proof is observed on the target side (the server-side HEAD shows up in the internal service’s log), since the canFrame field alone leaks little.