CVE-2026-33943
CVE-2026-33943
8.8
HighPublished:
Last updated:
Source:security-advisories@github.com
Analyzed
Weakness (CWE)
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- Low
- Privileges Required
- None
- User Interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Description
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in `ECMAScriptModuleCompiler` allows an attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions inside `export { }` declarations in ES module scripts processed by happy-dom. The compiler directly interpolates unsanitized content into generated code as an executable expression, and the quote filter does not strip backticks, allowing template literal-based payloads to bypass sanitization. Version 20.8.8 fixes the issue.
References
security-advisories@github.com
https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3csecurity-advisories@github.com
https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8security-advisories@github.com
https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64134c704f-9b21-4f2e-91b3-4a467353bcc0
https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64