CVE-2026-46625 (GCVE-0-2026-46625)

Vulnerability from cvelistv5 – Published: 2026-06-10 21:18 – Updated: 2026-08-13 12:04
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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-11 14:46 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
  • CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
Impacted products
Vendor Product Version
js-cookie js-cookie Affected: < 3.0.7
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Red Hat Cryostat 4 on RHEL 9 Unaffected: 4.2.0-13 , < * (rpm)
    cpe:/a:redhat:cryostat:4::el9
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10 Unaffected: 1783357140 , < * (rpm)
    cpe:/a:redhat:advanced_cluster_security:4.10::el8
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Red Hat Red Hat Developer Hub 1.10 Unaffected: 1785333413 , < * (rpm)
    cpe:/a:redhat:rhdh:1.10::el9
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Red Hat Red Hat Developer Hub 1.10 Unaffected: 1785340831 , < * (rpm)
    cpe:/a:redhat:rhdh:1.10::el9
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Red Hat Red Hat Developer Hub 1.10 Unaffected: 1785332928 , < * (rpm)
    cpe:/a:redhat:rhdh:1.10::el9
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Red Hat Red Hat Developer Hub 1.10 Unaffected: 1785411652 , < * (rpm)
    cpe:/a:redhat:rhdh:1.10::el9
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Red Hat Red Hat Developer Hub 1.9 Unaffected: 1785972843 , < * (rpm)
    cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat OpenShift Service Mesh 3.3 Unaffected: 1782231869 , < * (rpm)
    cpe:/a:redhat:service_mesh:3.3::el9
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Red Hat Red Hat OpenShift Service Mesh 3.3 Unaffected: 1782201466 , < * (rpm)
    cpe:/a:redhat:service_mesh:3.3::el9
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat Red Hat 3scale API Management Platform 2     cpe:/a:redhat:red_hat_3scale_amp:2
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Discovery 2     cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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This allows the attacker to set sensitive cookie attributes such as `domain`, `secure`, `samesite`, `expires`, and `path`, potentially leading to security bypasses or session manipulation.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-915\", \"description\": \"Improperly Controlled Modification of Dynamically-Determined Object Attributes\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-08-13T12:04:30.154Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-46625\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-11T14:46:15.083511Z\"}}}], \"references\": [{\"url\": \"https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T14:46:50.296Z\"}}], \"cna\": {\"title\": \"JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection\", \"source\": {\"advisory\": \"GHSA-qjx8-664m-686j\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"js-cookie\", \"product\": \"js-cookie\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 3.0.7\"}]}], \"references\": [{\"url\": \"https://github.com/js-cookie/js-cookie/security/advisories/GHSA-qjx8-664m-686j\", \"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/commit/eb3c40e89731e99b8970faaf35ddad249c6c0020\", \"name\": \"https://github.com/js-cookie/js-cookie/commit/eb3c40e89731e99b8970faaf35ddad249c6c0020\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/js-cookie/js-cookie/releases/tag/v3.0.7\", \"name\": \"https://github.com/js-cookie/js-cookie/releases/tag/v3.0.7\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"JavaScript Cookie is a JavaScript API for handling cookies, client-side. Prior to version 3.0.7, js-cookie\u0027s internal assign() helper copies properties with for...in + plain assignment. When the source object is produced by JSON.parse, the JSON object\u0027s \\\"__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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1321\", \"description\": \"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-06-10T21:18:05.372Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46625\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-13T12:04:30.154Z\", \"dateReserved\": \"2026-05-15T19:34:14.013Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-06-10T21:18:05.372Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.