CVE-2026-118250: high-severity vulnerability in highcharts
Highcharts: dotted series.keys paths write to Object.prototype
Published
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.2epss 0.4%
exploitation probability
0.4%top 70% of all CVEs
observed exploitation
nono source reports it
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.
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
Affected products
highcharts · highchartsRelated CVEs — highcharts
In the same product, most dangerous first.
CVE-2021-29489HIGHOptions structure open to XSS if passed unfilteredEPSS 0.9%CVE-2026-118251HIGHHighcharts: javascript: URL in credits.href runs script on clickEPSS 0.4%CVE-2026-118254HIGHHighcharts Grid: pagination language options are parsed as HTMLEPSS 0.4%CVE-2026-118253HIGHHighcharts Dashboards: fullscreen labels are parsed as HTMLEPSS 0.4%CVE-2026-118252HIGHHighcharts Dashboards: sidebar component labels are parsed as HTMLEPSS 0.4%CVE-2026-118249HIGHHighcharts: series column construction writes to Object.prototypeEPSS 0.4%