{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46625", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-15T19:34:14.013Z", "datePublished": "2026-06-10T21:18:05.372Z", "dateUpdated": "2026-06-11T16:14:53.239Z"}, "containers": {"cna": {"title": "JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection", "problemTypes": [{"descriptions": [{"cweId": "CWE-1321", "lang": "en", "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j"}, {"name": "https://github.com/js-cookie/js-cookie/commit/eb3c40e89731e99b8970faaf35ddad249c6c0020", "tags": ["x_refsource_MISC"], "url": "https://github.com/js-cookie/js-cookie/commit/eb3c40e89731e99b8970faaf35ddad249c6c0020"}, {"name": "https://github.com/js-cookie/js-cookie/releases/tag/v3.0.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/js-cookie/js-cookie/releases/tag/v3.0.7"}], "affected": [{"vendor": "js-cookie", "product": "js-cookie", "versions": [{"version": "< 3.0.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-10T21:18:05.372Z"}, "descriptions": [{"lang": "en", "value": "JavaScript Cookie is a JavaScript API for handling cookies, client-side. Prior to version 3.0.7, js-cookie's internal assign() helper copies properties with for...in + plain assignment. When the source object is produced by JSON.parse, the JSON object's \"__proto__\" member is an own enumerable property, so the for\u2026in enumerates it and the target[key] = source[key] write triggers the Object.prototype.__proto__ setter on the fresh target ({}). The result is a per-instance prototype hijack: Object.prototype itself is untouched, but the merged attributes object now inherits attacker-controlled keys. Because the consuming set() function then enumerates the merged object with another for...in, every key the attacker placed on the polluted prototype lands in the resulting Set-Cookie string as an attribute pair. The attacker can set domain=, secure=, samesite=, expires=, and path= on cookies whose attributes the developer thought were locked down. This issue has been patched in version 3.0.7."}], "source": {"advisory": "GHSA-qjx8-664m-686j", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-11T14:46:15.083511Z", "id": "CVE-2026-46625", "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": "2026-06-11T16:14:53.239Z"}}]}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.0.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "js-cookie", "source": "cna", "vendor": "js-cookie"}, "product": "js-cookie", "vendor": "js-cookie"}], "created": "2026-06-10T23:00:20.842306+00:00", "updated": "2026-06-11T10:40:44.639392+00:00", "vendors": ["js-cookie", "js-cookie$PRODUCT$js-cookie"]}