CVE-2026-118243

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    CVE-2026-118243

    Published: 28 Oct 2026Last Modified: 4 Nov 2026

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

    Details: 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.

    References: https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118243.json, https://github.com/highcharts/highcharts/security/advisories/GHSA-jqgh-w3cc-7jqw, https://nvd.nist.gov/vuln/detail/CVE-2026-118243, https://github.com/highcharts/highcharts/commit/ade5a41a700212f09133223ca990a3737d1d9ec6

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- ccdecb8282b7c857f6277b885c2657e4fb401f51
    Fixed -a6d047d719460b0de3aa79adb032115dcdc79054

    Affected versions

    v13.0.0
    v13.0.2
    v13.0.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118243 | CVE-DB