Vulnerability-Lookup

CVE-2026-118243 (GCVE-0-2026-118243)

Vulnerability from cvelistv5 – Published: 2026-10-28 17:33 – Updated: 2026-10-28 17:33

Title

Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototype`

Summary

Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards stores DataCursor listener and state maps in plain objects keyed by DataTable ID. A __proto__ table ID supplied through dataPool connector configuration resolves to Object.prototype, and sync registration creates an enumerable property there whose suffix can be influenced through the sync group option. The property is visible on every object, and lasting sync states can throw and stop features such as extremes synchronization. Exploitation requires untrusted dashboard configuration and an enabled component sync, but no user interaction beyond loading the board. This issue is fixed in 4.2.2.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7951 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/highcharts/highcharts/security…	x_refsource_CONFIRM
https://github.com/highcharts/highcharts/commit/a…	x_refsource_MISC
https://github.com/highcharts/highcharts/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
highcharts	highcharts	Affected: >= 1.0.0, < 4.2.2	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "highcharts",
          "vendor": "highcharts",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 4.2.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards stores DataCursor listener and state maps in plain objects keyed by DataTable ID. A __proto__ table ID supplied through dataPool connector configuration resolves to Object.prototype, and sync registration creates an enumerable property there whose suffix can be influenced through the sync group option. The property is visible on every object, and lasting sync states can throw and stop features such as extremes synchronization. Exploitation requires untrusted dashboard configuration and an enabled component sync, but no user interaction beyond loading the board. This issue is fixed in 4.2.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1321",
              "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T17:33:31.422Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/highcharts/highcharts/security/advisories/GHSA-jqgh-w3cc-7jqw",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/highcharts/highcharts/security/advisories/GHSA-jqgh-w3cc-7jqw"
        },
        {
          "name": "https://github.com/highcharts/highcharts/commit/ade5a41a700212f09133223ca990a3737d1d9ec6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/highcharts/highcharts/commit/ade5a41a700212f09133223ca990a3737d1d9ec6"
        },
        {
          "name": "https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2"
        }
      ],
      "source": {
        "advisory": "GHSA-jqgh-w3cc-7jqw",
        "discovery": "UNKNOWN"
      },
      "title": "Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototype`"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-118243",
    "datePublished": "2026-10-28T17:33:31.422Z",
    "dateReserved": "2026-10-27T20:13:55.312Z",
    "dateUpdated": "2026-10-28T17:33:31.422Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-118243",
      "date": "2026-10-29",
      "epss": "0.00351",
      "percentile": "0.28736"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "highcharts",
                "vendor": "highcharts",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 1.0.0, \u003c 4.2.2"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards stores DataCursor listener and state maps in plain objects keyed by DataTable ID. A __proto__ table ID supplied through dataPool connector configuration resolves to Object.prototype, and sync registration creates an enumerable property there whose suffix can be influenced through the sync group option. The property is visible on every object, and lasting sync states can throw and stop features such as extremes synchronization. Exploitation requires untrusted dashboard configuration and an enabled component sync, but no user interaction beyond loading the board. This issue is fixed in 4.2.2."
          }
        ],
        "id": "CVE-2026-118243",
        "lastModified": "2026-10-29T15:08:43.210",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "LOW",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "LOW",
                "subConfidentialityImpact": "LOW",
                "subIntegrityImpact": "LOW",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "LOW",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-28T18:17:15.103",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/highcharts/highcharts/commit/ade5a41a700212f09133223ca990a3737d1d9ec6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/highcharts/highcharts/security/advisories/GHSA-jqgh-w3cc-7jqw"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-1321"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}

GHSA-JQGH-W3CC-7JQW

Vulnerability from github – Published: 2026-10-28 19:55 – Updated: 2026-10-28 19:55

Summary

Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototype`

Details

Impact

The data cursor keeps its listener and state bookkeeping in plain objects keyed by data table id, so a table id of __proto__ supplied in the dataPool connector configuration resolves to Object.prototype when a sync registers its listeners, and the registration creates a property on Object.prototype named after the sync state and holding the internal listener array. The property name begins with a state prefix fixed by the library, to which the sync group option can append an attacker-chosen suffix, and its value is the library's own listener array, but the property is enumerable and visible on every object in the page, and emitting a lasting state for that table id then throws, so syncs that keep lasting states, such as extremes, stop working. Exploitation requires that untrusted data reach the Dashboards configuration and that a sync such as highlight or extremes be enabled on a component using that table, which the same configuration can do. No user interaction is required beyond loading the board.

The injected property is inert until other code on the page reads or enumerates it, so consequences depend on the consuming application.

Workarounds

Drop-in fix - for any Highcharts Dashboards versions affected (1.0.0-4.2.1). Add the below IIFE to run after Highcharts Dashboards is loaded.

!function(t){if(t&&t.DataCursor&&t.DataTable){var e=t.DataCursor.prototype,r=t.DataTable.prototype;e.tableIdPollutionPatched||(e.tableIdPollutionPatched=!0,null!==Object.getPrototypeOf((new t.DataCursor).listenerMap)&&['addListener','emitCursor','remitCursor','removeListener'].forEach(function(t){var r=e[t];r&&(e[t]=function(){var t;return t=this,['listenerMap','stateMap'].forEach(function(e){var r,a=t[e];a&&null!==Object.getPrototypeOf(a)&&(r=Object.create(null),Object.keys(a).forEach(function(t){r[t]=a[t]}),t[e]=r)}),r.apply(this,arguments)})}),'__proto__'!==new t.DataTable({id:'__proto__'}).id||Object.getOwnPropertyDescriptor(r,'id')||Object.defineProperty(r,'id',{configurable:!0,enumerable:!0,get:function(){return this.safeTableId},set:function(e){'__proto__'!==e&&'constructor'!==e||(e=t.uniqueKey(),this.autoId=!0),this.safeTableId=e}}))}}(Dashboards);

Live demo & testing

Obtaining the patched version

The patched releases are available from all the usual distribution channels. With npm, upgrade the affected package to the patched version listed above, for example npm install @highcharts/dashboards@4.2.2. If you load Highcharts Dashboards from a CDN, use a versioned URL, for example https://code.highcharts.com/dashboards/4.2.2/dashboards.js. For more on each installation method, see the installation guide.

Severity

5.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@highcharts/dashboards"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "4.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-118243"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-28T19:55:32Z",
    "nvd_published_at": "2026-10-28T18:17:15Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe data cursor keeps its listener and state bookkeeping in plain objects keyed by data table id, so a table id of `__proto__` supplied in the `dataPool` connector configuration resolves to `Object.prototype` when a sync registers its listeners, and the registration creates a property on `Object.prototype` named after the sync state and holding the internal listener array. The property name begins with a state prefix fixed by the library, to which the sync `group` option can append an attacker-chosen suffix, and its value is the library\u0027s own listener array, but the property is enumerable and visible on every object in the page, and emitting a lasting state for that table id then throws, so syncs that keep lasting states, such as `extremes`, stop working. Exploitation requires that untrusted data reach the Dashboards configuration and that a sync such as `highlight` or `extremes` be enabled on a component using that table, which the same configuration can do. No user interaction is required beyond loading the board.\n\nThe injected property is inert until other code on the page reads or enumerates it, so consequences depend on the consuming application.\n\n### Workarounds\n**Drop-in fix - for any Highcharts Dashboards versions affected (1.0.0-4.2.1).**\nAdd the below IIFE to run after Highcharts Dashboards is loaded. \n\n```\n!function(t){if(t\u0026\u0026t.DataCursor\u0026\u0026t.DataTable){var e=t.DataCursor.prototype,r=t.DataTable.prototype;e.tableIdPollutionPatched||(e.tableIdPollutionPatched=!0,null!==Object.getPrototypeOf((new t.DataCursor).listenerMap)\u0026\u0026[\u0027addListener\u0027,\u0027emitCursor\u0027,\u0027remitCursor\u0027,\u0027removeListener\u0027].forEach(function(t){var r=e[t];r\u0026\u0026(e[t]=function(){var t;return t=this,[\u0027listenerMap\u0027,\u0027stateMap\u0027].forEach(function(e){var r,a=t[e];a\u0026\u0026null!==Object.getPrototypeOf(a)\u0026\u0026(r=Object.create(null),Object.keys(a).forEach(function(t){r[t]=a[t]}),t[e]=r)}),r.apply(this,arguments)})}),\u0027__proto__\u0027!==new t.DataTable({id:\u0027__proto__\u0027}).id||Object.getOwnPropertyDescriptor(r,\u0027id\u0027)||Object.defineProperty(r,\u0027id\u0027,{configurable:!0,enumerable:!0,get:function(){return this.safeTableId},set:function(e){\u0027__proto__\u0027!==e\u0026\u0026\u0027constructor\u0027!==e||(e=t.uniqueKey(),this.autoId=!0),this.safeTableId=e}}))}}(Dashboards);\n```\n\n[Live demo \u0026 testing](https://jsfiddle.net/BlackLabel/jwqazb51/)\n\n### Obtaining the patched version\nThe patched releases are available from all the usual distribution channels. With npm, upgrade the affected package to the patched version listed above, for example `npm install @highcharts/dashboards@4.2.2`. If you load Highcharts Dashboards from a CDN, use a versioned URL, for example `https://code.highcharts.com/dashboards/4.2.2/dashboards.js`. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/dashboards/installation).",
  "id": "GHSA-jqgh-w3cc-7jqw",
  "modified": "2026-10-28T19:55:32Z",
  "published": "2026-10-28T19:55:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/security/advisories/GHSA-jqgh-w3cc-7jqw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118243"
    },
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/commit/ade5a41a700212f09133223ca990a3737d1d9ec6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/highcharts/highcharts"
    },
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototype`"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted