{"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"}}}}