{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34226","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-26T16:22:29.033Z","datePublished":"2026-03-27T21:17:24.777Z","dateUpdated":"2026-03-31T14:25:27.402Z"},"containers":{"cna":{"title":"Happy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookies","problemTypes":[{"descriptions":[{"cweId":"CWE-201","lang":"en","description":"CWE-201: Insertion of Sensitive Information Into Sent Data","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-359","lang":"en","description":"CWE-359: Exposure of Private Personal Information to an Unauthorized Actor","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g","tags":["x_refsource_CONFIRM"],"url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-w4gp-fjgq-3q4g"},{"name":"https://github.com/capricorn86/happy-dom/pull/2117","tags":["x_refsource_MISC"],"url":"https://github.com/capricorn86/happy-dom/pull/2117"},{"name":"https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751","tags":["x_refsource_MISC"],"url":"https://github.com/capricorn86/happy-dom/commit/68324c21d7b98f53f7bb5a7b3e185bda7106e751"},{"name":"https://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.ts","tags":["x_refsource_MISC"],"url":"https://github.com/capricorn86/happy-dom/blob/f8d8cad41e9722fab9eefb9dfb3cca696462e908/packages/happy-dom/src/fetch/utilities/FetchRequestHeaderUtility.ts"},{"name":"https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9","tags":["x_refsource_MISC"],"url":"https://github.com/capricorn86/happy-dom/releases/tag/v20.8.9"}],"affected":[{"vendor":"capricorn86","product":"happy-dom","versions":[{"version":"< 20.8.9","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-03-27T21:17:24.777Z"},"descriptions":[{"lang":"en","value":"Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Versions prior to 20.8.9 may attach cookies from the current page origin (`window.location`) instead of the request target URL when `fetch(..., { credentials: \"include\" })` is used. This can leak cookies from origin A to destination B. Version 20.8.9 fixes the issue."}],"source":{"advisory":"GHSA-w4gp-fjgq-3q4g","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-31T14:25:16.015238Z","id":"CVE-2026-34226","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-31T14:25:27.402Z"}}]}}