--- title: "CVE-2026-118252: Highcharts JS - Stored XSS" description: "Highcharts JS <= 4.2.3 contains a stored XSS caused by parsing component language strings as HTML in Dashboards edit-mode sidebar, letting attackers execute scripts in the hosting page when users open the sidebar, exploit requires attacker control of language configuration." url: https://panop.io/threat-heartbeat/CVE-2026-118252/ --- # CVE-2026-118252 Highcharts JS - Stored XSS Highcharts JS <= 4.2.3 contains a stored XSS caused by parsing component language strings as HTML in Dashboards edit-mode sidebar, letting attackers execute scripts in the hosting page when users open the sidebar, exploit requires attacker control of language configuration. CVSS base score 8.4 /10 High CISA KEV Not listed Public exploit None known [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-118252) ## Details Type Stored XSS Impact Stored XSS CVSS vector 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Published 28 October 2026 Updated 29 October 2026 Weakness [CWE-79](https://cwe.mitre.org/data/definitions/79.html) ## Vendor fix Update to version 4.2.3 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-118252](https://nvd.nist.gov/vuln/detail/CVE-2026-118252) - [https://github.com/highcharts/highcharts/commit/e65f8c21b9974dcccfa1c600a375d836acef4a7d](https://github.com/highcharts/highcharts/commit/e65f8c21b9974dcccfa1c600a375d836acef4a7d) - [https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.3](https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.3) - [https://github.com/highcharts/highcharts/security/advisories/GHSA-rcqf-f6h2-ccg9](https://github.com/highcharts/highcharts/security/advisories/GHSA-rcqf-f6h2-ccg9) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)