CVE-2025-65026

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/esm-dev/esm.sh/commit/87d2f6497574bf4448641a5527a3ac2beba5fd6c	Patch
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-hcpf-qv9m-vfgp	Exploit Vendor Advisory
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-hcpf-qv9m-vfgp	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:esm:esm.sh:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-11-19 18:15

Updated : 2026-01-15 17:53

NVD link : CVE-2025-65026

Mitre link : CVE-2025-65026

CVE.ORG link : CVE-2025-65026

JSON object : View

Products Affected

esm

esm.sh

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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