CVE-2025-65026 – esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript

CVE ID : CVE-2025-65026

Published : Nov. 19, 2025, 5:33 p.m. | 19 minutes ago

Description : esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, The esm.sh CDN service contains a Template Literal Injection vulnerability (CWE-94) in its CSS-to-JavaScript module conversion feature. When a CSS file is requested with the ?module query parameter, esm.sh converts it to a JavaScript module by embedding the CSS content directly into a template literal without proper sanitization. An attacker can inject malicious JavaScript code using ${…} expressions within CSS files, which will execute when the module is imported by victim applications. This enables Cross-Site Scripting (XSS) in browsers and Remote Code Execution (RCE) in Electron applications. This issue has been patched in version 136.

Severity: 0.0 | NA

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