{"schema":"threatline.record/2","record":{"id":"CVE-2026-118661","aliases":["GHSA-5fpq-26gf-qwcr"],"summary":"Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies","details":"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.","categories":["Unclassified"],"product":"happy-dom","vendor":"capricorn86","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118661","source_modified_at":"2026-10-28T20:30:23.868Z","fetched_at":"2026-10-28T20:58:01.013507Z","product":"happy-dom","vendor":"capricorn86","versions":[{"version":"< 20.14.6","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.5,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T20:30:23.868Z","modified_at":"2026-10-28T20:30:23.868Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-118661","fetched_at":"2026-10-28T20:58:01.013507Z","source_modified_at":"2026-10-28T20:30:23.868Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/capricorn86/happy-dom/pull/2477","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-28T20:30:23.868Z","content_hash":"0fdca16be4fb77485029c5203fd0c1bbcfe764002af982f004d39f83cc62c9a8"}}