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High, CVSS 8.4amended

Highcharts Dashboards parses fullscreen labels as HTML

CVE-2026-118253GHSA-58g7-7f52-h92c

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@highcharts/dashboards 4.2.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N · score source
EPSS
  • CVE-2026-118253: 0.42% estimated exploitation activity in the next 30 days; percentile 36.26 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact The edit mode fullscreen labels are parsed as HTML when the corresponding control is rendered. An attacker who controls the Dashboards language options can supply markup carrying event handlers, which then execute in the origin of the page hosting the dashboard. Exploitation requires that untrusted data reach the Dashboards language configuration and that the affected control be rendered. Script running this way has the same access to page data, storage and session state as the hosting application.

Workarounds Until you can upgrade, replace `Fullscreen.prototype.setButtonText` atapplication startup. The replacement is the original method with `textContent` in place of `innerHTML`.

If you install Dashboards from npm Import the module once, before any board is created. ```js import Fullscreen from '@highcharts/dashboards/es-modules/Dashboards/EditMode/Fullscreen.js'; Fullscreen.prototype.setButtonText = function () { const editMode = this.board.editMode, button =…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-58g7-7f52-h92c

  2. Revision 1 · created ·

    Published from ghsa record GHSA-58g7-7f52-h92c

Agent brief

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# Patch Next advisory brief: CVE-2026-118253

Advisory: Highcharts Dashboards parses fullscreen labels as HTML
IDs: CVE-2026-118253, GHSA-58g7-7f52-h92c
Record: https://patchnext.com/advisories/cve-2026-118253 (revision 2, source checked 29 Oct 2026, 06:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @highcharts/dashboards 4.2.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @highcharts/dashboards: affected >= 1.0.0, < 4.2.3; fixed in 4.2.3

## Suggested inspection (read-only)
- `npm ls @highcharts/dashboards --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @highcharts/dashboards.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-58g7-7f52-h92c (GitHub-reviewed advisory GHSA-58g7-7f52-h92c lists affected ranges: npm @highcharts/dashboards >=1.0.0 <4.2.3)
- Verified: https://osv.dev/vulnerability/GHSA-58g7-7f52-h92c (OSV record GHSA-58g7-7f52-h92c lists affected ranges: npm @highcharts/dashboards >=1.0.0 <4.2.3 (fixed))

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