High severity · published Oct 28, 2026
CVE-2026-118253
Highcharts Dashboards: fullscreen labels are parsed as HTML
New
8.4
CVSS
–
EPSS
No
On KEV
Description
Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.3, Highcharts Dashboards edit mode parses fullscreen language labels as HTML rather than inserting them as text. An attacker who controls Dashboards language options can supply markup with event handlers, which execute in the hosting page origin when the fullscreen control is rendered. The label is reachable only when edit mode is enabled and viewFullscreen is present in the context-menu items. This issue is fixed in 4.2.3.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DA
dashboards · @highcharts
>= 1.0.0, < 4.2.3 · source: vendor
HI
highcharts · highcharts
< 13.0.0-beta.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118253
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118253
x_refsource_CONFIRM
https://github.com/highcharts/highcharts/security/advisories/GHSA-58g7-7f52-h92c
x_refsource_MISC
https://github.com/highcharts/highcharts/commit/f97213bab745e40f628720c21f4e8b31ee3e768b
x_refsource_MISC
https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.3
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