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A researcher discovered a zero-day Server-Side Template Injection (SSTI) vulnerability in the Handlebars template engine used in Shopify's Return Magic app, achieving Remote Code Execution by exploiting Object.prototype methods and the Function constructor to bypass sandbox restrictions. The exploit leverages the 'with' helper and Object.prototype.defineProperty() to inject arbitrary code through email workflow templates.

Handlebars Shopify Return Magic HackerOne H1-514 Synack TrendMicro Matias
mahmoudsec.blogspot.com · devanshbatham/Awesome-Bugbounty-Writeups · 4 hours ago · details