High · CVSS 8.4CVE-2026-118253

Highcharts Dashboards: fullscreen labels are parsed as HTMLCVE-2026-118253

Answer in brief

CVE-2026-118253 records a High severity (CVSS 8.4) vulnerability in Highcharts Dashboards: fullscreen labels are parsed as HTML. The current sources do not mark it as known exploited. The current feed maps @highcharts/dashboards (generic), highcharts/highcharts (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 28, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Oct 28, 2026Material review Oct 28, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps @highcharts/dashboards (generic), highcharts/highcharts (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
@highcharts/dashboardsgeneric	>=1.0.0 <4.2.3	4.2.3
highcharts/highchartsgeneric	<13.0.0-beta.2	13.0.0-beta.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for @highcharts/dashboards, highcharts/highcharts.
Review the reported fix. Update @highcharts/dashboards to 4.2.3; highcharts/highcharts to 13.0.0-beta.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 28, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.