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2 vulnerabilities found for js-cookie by js-cookie
CVE-2026-46625 (GCVE-0-2026-46625)
Vulnerability from nvd – Published: 2026-06-10 21:18 – Updated: 2026-06-30 12:10
VLAI
Title
JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection
Summary
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…in 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.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/js-cookie/js-cookie/security/a… | x_refsource_CONFIRM |
| https://github.com/js-cookie/js-cookie/commit/eb3… | x_refsource_MISC |
| https://github.com/js-cookie/js-cookie/releases/t… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-46625 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2487740 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:33183 | vendor-advisoryx_refsource_REDHAT |
Impacted products
18 products
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CVE-2026-46625 (GCVE-0-2026-46625)
Vulnerability from cvelistv5 – Published: 2026-06-10 21:18 – Updated: 2026-06-30 12:10
VLAI
Title
JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection
Summary
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…in 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.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/js-cookie/js-cookie/security/a… | x_refsource_CONFIRM |
| https://github.com/js-cookie/js-cookie/commit/eb3… | x_refsource_MISC |
| https://github.com/js-cookie/js-cookie/releases/t… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-46625 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2487740 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:33183 | vendor-advisoryx_refsource_REDHAT |
Impacted products
18 products
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"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"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1321",
"description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-10T21:18:05.372Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"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"
}
],
"source": {
"advisory": "GHSA-qjx8-664m-686j",
"discovery": "UNKNOWN"
},
"title": "JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-46625",
"datePublished": "2026-06-10T21:18:05.372Z",
"dateReserved": "2026-05-15T19:34:14.013Z",
"dateUpdated": "2026-06-30T12:10:03.353Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}