{"id":"CVE-2026-118248","title":"Highcharts Dashboards: editableOptions.propertyPath writes to Object.prototype","summary":"Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards edit mode walks editableOptions propertyPath segments without rejecting prototype-related keys. An attacker who controls editableO…","severity":"medium","cvss":6.9,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:H/SC:L/SI:L/SA:L","cvssSource":"cna","cwe":["CWE-1321"],"vendor":"highcharts","product":"highcharts","affected":["highcharts < 13.1.0","dashboards >= 1.0.0, < 4.2.2"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T17:55:47.520Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118248","references":[{"url":"https://github.com/highcharts/highcharts/security/advisories/GHSA-wg5j-9wp8-2ggm","label":"https://github.com/highcharts/highcharts/security/advisories/GHSA-wg5j-9wp8-2ggm"},{"url":"https://github.com/highcharts/highcharts/commit/05efb9849130461fe61992ea8f58d22edaad978b","label":"https://github.com/highcharts/highcharts/commit/05efb9849130461fe61992ea8f58d22edaad978b"},{"url":"https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2","label":"https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T18:15:46.375Z","slug":"CVE-2026-118248","body":"## Overview\n\nHighcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards edit mode walks editableOptions propertyPath segments without rejecting prototype-related keys. An attacker who controls editableOptions can provide a path through __proto__ or constructor, and a user's edit writes the configured value onto Object.prototype. The property then becomes visible to JavaScript throughout the page, with consequences determined by the consuming application. This issue is fixed in 4.2.2.\n\n## Affected\n\n- `highcharts < 13.1.0`\n- `dashboards >= 1.0.0, < 4.2.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}