High severity · published Oct 28, 2026
CVE-2026-118250
Highcharts: dotted series.keys paths write to Object.prototype
New
7.2
CVSS
–
EPSS
No
On KEV
Description
Highcharts JS is a JavaScript charting library based on SVG. From 6.1.0 until 11.4.9, 12.6.1, and 3.1.0, Highcharts follows dot-separated series.keys paths without filtering each segment. An attacker who controls series.keys and matching point data can use a path through __proto__ to assign arbitrary named properties to Object.prototype. Those properties are visible to all JavaScript in the page, and no user interaction is required beyond rendering the chart. This issue is fixed in 11.4.9, 12.6.1, and 3.1.0.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HI
highcharts · highcharts
>= 6.1.0, < 11.4.9; >= 12.0.0, < 12.6.1; >= 13.0.0, < 13.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118250
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118250
x_refsource_CONFIRM
https://github.com/highcharts/highcharts/security/advisories/GHSA-rmqc-xvr3-v46c
x_refsource_MISC
https://github.com/highcharts/highcharts/pull/25313
x_refsource_MISC
https://github.com/highcharts/highcharts/commit/fd4ee8140732618bbe71295aba55398fb1f8fa9e
x_refsource_MISC
https://github.com/highcharts/highcharts/releases/tag/v13.1.0
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