CVE-2026-118249: high-severity vulnerability in highcharts
Highcharts: series column construction writes to Object.prototype
Published · Updated
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 13.0.0 until 13.1.0, Highcharts builds series data columns by using point option keys directly as column IDs. Own enumerable __proto__ and constructor keys from parsed point objects can therefore direct integer-indexed writes to Object.prototype or the Object constructor. The inherited values affect reads and for-in enumeration across the page and can disrupt rendering or alter consuming application behavior without user interaction beyond rendering the chart. This issue is fixed in 13.1.0.
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-2026-118250HIGHHighcharts: dotted series.keys paths write to Object.prototypeEPSS 0.4%