CVE-2025-65026
published 2025-11-19CVE-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…
PriorityP348critical9.6CVSS 3.1
AVNACLPRNUIRSCCHIHAH
EPSS
0.44%
35.0th percentile
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 ${...} expressions within CSS files, which will execute when the module is imported by victim applications. This enables Cross-Site Scripting (XSS) in browsers and Remote Code Execution (RCE) in Electron applications. This issue has been patched in version 136.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| esm-dev | esm.sh | < 136 | 136 |
| esm | esm.sh | < 136 | 136 |
| github.com | esm-dev_esm.sh | >= 0 < 0.0.0-20251118065157-87d2f6497574 | 0.0.0-20251118065157-87d2f6497574 |
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OSV
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript in github.com/esm-dev/esm.sh
osv·2025-11-25
CVE-2025-65026 esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript in github.com/esm-dev/esm.sh
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript in github.com/esm-dev/esm.sh
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript in github.com/esm-dev/esm.sh
OSV
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript
osv·2025-11-19
CVE-2025-65026 [MEDIUM] esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript
### Summary
The esm.sh CDN service contains a Template Literal Injection vulnerability (CWE-94) in its CSS-to-JavaScript module conversion feature.
When a CSS file is requested with the `?module` query parameter, esm.sh converts it to a JavaScript module by embedding the CSS content directly into a template literal without proper sanitization.
An attacker can inject malicious JavaScript code using `${...}` 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.
**Root Cause:**
The CSS module conversion logic (`router.go:1112-1119`) performs incomplete sanitizat
GHSA
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript
ghsa·2025-11-19
CVE-2025-65026 [MEDIUM] CWE-94 esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript
esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript
### Summary
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.
**Root Cause:**
The CSS module conversion logic (`router.go:1112-1119`) performs incomplete sanitizat
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-11-19
Published