{"id":"CVE-2026-118661","state":"PUBLISHED","title":"Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies","description":"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.","publishedAt":"2026-10-28T20:30:23.868Z","updatedAt":"2026-10-28T20:30:23.868Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["capricorn86 happy-dom"],"affected":[{"vendor":"capricorn86","product":"happy-dom","versions":[{"version":"< 20.14.6","status":"affected"}]}],"references":["https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr","https://github.com/capricorn86/happy-dom/pull/2477","https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3","https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6"],"weaknesses":["CWE-565"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118661.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118661","state":"PUBLISHED","datePublished":"2026-10-28T20:30:23.868Z","dateUpdated":"2026-10-28T20:30:23.868Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-28T17:25:37.561Z"},"containers":{"cna":{"title":"Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies","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."}],"affected":[{"vendor":"capricorn86","product":"happy-dom","versions":[{"version":"< 20.14.6","status":"affected"}]}],"references":[{"url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr","name":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/capricorn86/happy-dom/pull/2477","name":"https://github.com/capricorn86/happy-dom/pull/2477","tags":["x_refsource_MISC"]},{"url":"https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3","name":"https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3","tags":["x_refsource_MISC"]},{"url":"https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6","name":"https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-565","lang":"en","description":"CWE-565: Reliance on Cookies without Validation and Integrity Checking","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-28T20:30:23.868Z"},"source":{"advisory":"GHSA-5fpq-26gf-qwcr","discovery":"UNKNOWN"}}}}}