CVE-2026-33943

{
    "cve": {
        "id": "CVE-2026-33943",
        "cveTags": [],
        "metrics": {
            "cvssMetricV31": [
                {
                    "type": "Secondary",
                    "source": "security-advisories@github.com",
                    "cvssData": {
                        "scope": "UNCHANGED",
                        "version": "3.1",
                        "baseScore": 8.8,
                        "attackVector": "NETWORK",
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                        "integrityImpact": "HIGH",
                        "userInteraction": "REQUIRED",
                        "attackComplexity": "LOW",
                        "availabilityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "confidentialityImpact": "HIGH"
                    },
                    "impactScore": 5.9,
                    "exploitabilityScore": 2.8
                }
            ]
        },
        "published": "2026-03-27T22:16:21.393",
        "references": [
            {
                "url": "https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3c",
                "source": "security-advisories@github.com"
            },
            {
                "url": "https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8",
                "source": "security-advisories@github.com"
            },
            {
                "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64",
                "source": "security-advisories@github.com"
            },
            {
                "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64",
                "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
            }
        ],
        "vulnStatus": "Undergoing Analysis",
        "weaknesses": [
            {
                "type": "Primary",
                "source": "security-advisories@github.com",
                "description": [
                    {
                        "lang": "en",
                        "value": "CWE-94"
                    }
                ]
            }
        ],
        "descriptions": [
            {
                "lang": "en",
                "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."
            }
        ],
        "lastModified": "2026-03-30T13:26:07.647",
        "sourceIdentifier": "security-advisories@github.com"
    }
}