CVE-2026-118243

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Source
https://cve.org/CVERecord?id=CVE-2026-118243
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-118243.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-118243
Aliases
Published
2026-10-28T17:33:31Z
Modified
2026-10-29T02:48:17Z
Severity
  • 5.3 (Medium) CVSS_V4 - 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 CVSS Calculator
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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1321"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118243.json"
}
References

Affected packages

Git / github.com/highcharts/highcharts

Affected ranges

Type
GIT
Repo
https://github.com/highcharts/highcharts
Events
Introduced
ccdecb8282b7c857f6277b885c2657e4fb401f51
Fixed
a6d047d719460b0de3aa79adb032115dcdc79054
Fixed
ade5a41a700212f09133223ca990a3737d1d9ec6
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "1.0.0"
                },
                {
                    "fixed":  "4.2.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "ade5a41a700212f09133223ca990a3737d1d9ec6"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "dashboards-v4.2.2",
            "range":  [
                {
                    "fixed":  "a6d047d719460b0de3aa79adb032115dcdc79054"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

dashboards-v3.*
dashboards-v3.2.0
dashboards-v3.3.0
dashboards-v3.4.0
dashboards-v3.5.0
dashboards-v3.6.0
dashboards-v4.*
dashboards-v4.0.0
dashboards-v4.1.0
dashboards-v4.2.0
dashboards-v4.2.1
grid-v1.*
grid-v1.0.0
grid-v1.0.1
grid-v1.1.0
grid-v1.2.0
grid-v1.3.0
grid-v1.4.0
grid-v2.*
grid-v2.0.0
grid-v2.0.1
grid-v2.1.0
grid-v2.2.0
grid-v2.3.0
grid-v2.3.1
grid-v3.*
grid-v3.0.0
grid-v3.1.0
v12.*
v12.2.0
v12.3.0
v12.4.0
v12.5.0
v12.6.0
v13.*
v13.0.0
v13.0.1
v13.0.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-118243.json"