8.4 High

Highcharts Dashboards parses fullscreen labels as HTML

CVE-2026-118253

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 = editMode?.tools.contextMenu?.items.viewFullscreen; if (button?.innerElement) { const lang = editMode.lang; button.innerElement.textContent = (this.isOpen ? lang.exitFullscreen : lang.viewFullscreen) || ''; } }; If you load…

Assessment

CVSS: 8.4 (v4.0)
Severity: High
EPSS: 0.00419% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 28 October 2026
Affected: npm · @highcharts/dashboards
Weakness: CWE-79

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

At the source

GitHub Advisories

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

Submit a proof of concept

Only for publicly disclosed vulnerabilities, and only material from testing you were authorised to perform. This platform does not buy, sell, or broker exploits — see earning from vulnerability research for legitimate bounty programs. Submissions are reviewed before they appear. Text only; do not include live credentials, personal data, or anything targeting systems you are not permitted to test.

Title *

Proof of concept *

Write-up (optional)

Affected versions (optional)

Name or handle (optional)

References (optional, one URL per line)

Licence for your contribution *

Private contact (optional, never shown)

Before you submit * This vulnerability is already publicly disclosed (it has a published CVE). This material comes only from testing I was authorised to perform. I have the legal right to publish this content and am not breaching any agreement by doing so. It contains no live credentials, personal data, or anything targeting systems I am not authorised to test. I understand it will be reviewed before it appears publicly and may be rejected. I agree to the submission terms.

What is 4 + 4? *

Query this programmatically

Agents can read this through the MCP endpoint, or over HTTP:

curl https://cve.zerocrew.in/api/cve/CVE-2026-118253