Handlebars template injection exploit. npm › handlebars › CVE-2019-20920 8. Server-side template injection is a vulnerability that occurs when an attacker can inject malicious code into a template that is executed on the server. Server Side Template Injection vulnerabilities (SSTI) occur when user input is embedded in a template in an unsafe manner and results in remote code execution on the server. When user input isn’t properly sanitized, attackers can inject malicious code that gets executed on the server side. Any features that support advanced user-supplied markup may be vulnerable to Sep 1, 2025 ยท When working with Handlebars, developers often don’t realize how using templates the wrong way can expose serious injection flaws. This lab is vulnerable to server-side template injection. As a result, attackers may inject XSS payloads, steal data, or run malicious code. js template engine. txt file from Carlos's home directory. Researcher Mahmoud’s journey to discover a Handlebars template injection vulnerability in Shopify’s Return Magic app reads like a digital detective novel, complete with international travel, late-night hacking sessions, and a breakthrough at 30,000 Share This Article : Handlebars – Remote-code-execution Exploits Where Misusing prototype-builtins On Versions Under 4. ouvxqrxlxvoripvjylqtfxfkftffatghtuzfbkmxyarzhowhegcgcahmc