MarketingHub's email preview lets you drop in placeholders like {{name}} and {{company}}. It looks like simple variable substitution — but the engine actually evaluates whatever expression you put between the braces, not just a variable name. That gap is Server-Side Template Injection. Lab at a glance: Advanced · 110 XP · about 20 minutes · runs in your browser, no signup or setup. Try it yourself first; the full solution is behind a spoiler below. [se_lab_cta id="ssti-template-1"] 📋 In this…
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