{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-118661",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-28T17:25:37.561Z",
        "datePublished": "2026-10-28T20:30:23.868Z",
        "dateUpdated": "2026-10-28T20:30:23.868Z"
    },
    "containers": {
        "cna": {
            "title": "Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-565",
                            "lang": "en",
                            "description": "CWE-565: Reliance on Cookies without Validation and Integrity Checking",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr"
                },
                {
                    "name": "https://github.com/capricorn86/happy-dom/pull/2477",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capricorn86/happy-dom/pull/2477"
                },
                {
                    "name": "https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3"
                },
                {
                    "name": "https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6"
                }
            ],
            "affected": [
                {
                    "vendor": "capricorn86",
                    "product": "happy-dom",
                    "versions": [
                        {
                            "version": "< 20.14.6",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-28T20:30:23.868Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 20.14.6, Happy DOM's CookieContainer in src/cookie/CookieContainer.ts does not correctly validate or match Domain cookie attributes. It can accept a Domain unrelated to the origin setting the cookie, including a public suffix, and separately treats an unrelated suffix-sharing hostname as a match because cookieMatchesURL does not enforce a DNS-label boundary. In server-side rendering and prerendering applications that contact attacker-controlled origins and then make requests to a victim origin, these behaviors can plant and deliver a forged cookie, enabling cookie injection or session fixation. This issue is fixed in version 20.14.6."
                }
            ],
            "source": {
                "advisory": "GHSA-5fpq-26gf-qwcr",
                "discovery": "UNKNOWN"
            }
        }
    }
}