CVE-2026-33941— Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options

Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the Handlebars CLI precompiler (`bin/handlebars` / `lib/precompiler.js`) concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it emits, without any escaping or sanitization. An attacker who can influence template filenames or CLI arguments can inject arbitrary JavaScript that executes when the generated bundle is loaded in Node.js or a browser. Version 4.7.9 fixes the issue. Some workarounds are available. First, validate all CLI inputs before invoking the precompiler. Reject filenames and option values that contain characters with JavaScript string-escaping significance (`"`, `'`, `;`, etc.). Second, use a fixed, trusted namespace string passed via a configuration file rather than command-line arguments in automated pipelines. Third, run the precompiler in a sandboxed environment (container with no write access to sensitive paths) to limit the impact of successful exploitation. Fourth, audit template filenames in any repository or package that is consumed by an automated build pipeline.

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Handlebars.js 安全漏洞

Handlebars.js是The Handlebars Templating Language开源的一个JavaScript语义模板引擎。 Handlebars.js 4.7.8及之前版本存在安全漏洞，该漏洞源于Handlebars CLI预编译器对用户控制的字符串处理不当，可能导致攻击者注入任意JavaScript代码，在生成的包加载时执行。

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