{"id":"CVE-2026-118661","revision":"35cffcb5f38845e79502bf24970f2601","records":[{"revision":"35cffcb5f38845e79502bf24970f2601","observedAt":"2026-11-03T14:57:17.179+00:00","statement":{"source":"cve-program","id":"CVE-2026-118661","aliases":[],"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.","state":0,"publishedAt":"2026-10-28T20:30:23.868+00:00","modifiedAt":"2026-11-03T13:33:35.617+00:00","affected":[{"ecosystem":"Vendor product","name":"happy-dom","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"capricorn86\",\n                    \"product\": \"happy-dom\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 20.14.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118661","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-118661","identifiers":["CVE-2026-118661"]},"retained":false,"historicalAffected":[]}],"coverage":[]}