CVE-2026-118250

high

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.

References

https://github.com/highcharts/highcharts/security/advisories/GHSA-rmqc-xvr3-v46c

https://github.com/highcharts/highcharts/releases/tag/v13.1.0

https://github.com/highcharts/highcharts/pull/25313

https://github.com/highcharts/highcharts/commit/fd4ee8140732618bbe71295aba55398fb1f8fa9e

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112364

Details

Source: Mitre, NVD

Published: 2026-10-28

Updated: 2026-10-28

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 7.2

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

Severity: High