Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Esm | Esm.Sh | < 136 |
Related Weaknesses (CWE)
References
- https://github.com/esm-dev/esm.sh/commit/87d2f6497574bf4448641a5527a3ac2beba5fd6Patch
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-hcpf-qv9m-vfgpExploitVendor Advisory
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-hcpf-qv9m-vfgpExploitVendor Advisory
FAQ
What is CVE-2025-65026?
CVE-2025-65026 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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-Ja...
How severe is CVE-2025-65026?
CVE-2025-65026 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-65026?
Check the references section above for vendor advisories and patch information. Affected products include: Esm Esm.Sh.