FKIE_CVE-2026-33943

Vulnerability from fkie_nvd - Published: 2026-03-27 22:16 - Updated: 2026-04-13 17:24
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.comhttps://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3cPatch
security-advisories@github.comhttps://github.com/capricorn86/happy-dom/releases/tag/v20.8.8Product, Release Notes
security-advisories@github.comhttps://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64Exploit, Vendor Advisory
Impacted products
Vendor Product Version
capricorn86 happy_dom *
To clipboard 

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    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:capricorn86:happy_dom:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "7EAF0355-096E-4A40-8520-8FA8EBEF230B",
              "versionEndExcluding": "20.8.8",
              "versionStartIncluding": "15.10.0",
              "vulnerable": true
            }
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
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      "value": "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."
    }
  ],
  "id": "CVE-2026-33943",
  "lastModified": "2026-04-13T17:24:44.997",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
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          "confidentialityImpact": "HIGH",
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  "published": "2026-03-27T22:16:21.393",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-94"
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      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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