TI-2026-82134 Aliases CVE-2026-118248

Prototype pollution in Highcharts Dashboards edit mode

LOW 30CWE-1321Published 2026-10-28 · Updated 2026-10-30

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Highcharts Dashboards from 1.0.0 before 4.2.2 and the highcharts package before 13.1.0 are affected. Edit mode walks editableOptions propertyPath segments without rejecting __proto__ or constructor keys (CWE-1321). An attacker with low privileges who controls editableOptions can make a user's edit write a value onto Object.prototype, where JavaScript across the page can see it, with consequences set by the consuming application.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0028 20th percentileScored 2026-11-07

Fix Fixed highcharts (highcharts): 13.1.0dashboards (@highcharts): 4.2.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
highcharts	highcharts	before 13.1.0	13.1.0	Patch available	CNA
highcharts	dashboards	1.0.0 to before 4.2.2	4.2.2	Patch available	CNA

highcharts Vendorhighcharts Affected before 13.1.0 Fixed in 13.1.0 Patch available CNA
dashboards Vendorhighcharts Affected 1.0.0 to before 4.2.2 Fixed in 4.2.2 Patch available CNA

Remediation

Update Highcharts Dashboards to 4.2.2 and the highcharts package to 13.1.0.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA highcharts (highcharts) Fixed in 13.1.0
Fix · CNA dashboards (@highcharts) Fixed in 4.2.2

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-28 Threatist record created from CVE-2026-118248
2026-10-30 Priority changed: MEDIUM → LOW
2026-10-30 CISA SSVC decision points changed
2026-11-06 Affected versions changed · Red Hat
2026-11-06 CVSS score added · Red Hat

References

Other 3

TI-2026-82141 Highcharts Grid parses pagination language options as HTML CVSS 4.0HIGH 8.6
TI-2026-82140 Cross-site scripting in Highcharts Dashboards fullscreen labels CVSS 4.0HIGH 8.4
TI-2026-82139 Cross-site scripting in Highcharts Dashboards sidebar labels CVSS 4.0HIGH 8.4
TI-2026-82131 Cross-site scripting in Highcharts Dashboards via chartConstructor CVSS 4.0HIGH 8.6
TI-2026-82128 Cross-site scripting in Highcharts Grid icon definitions CVSS 4.0HIGH 8.5
TI-2026-82125 Cross-site scripting in Highcharts Grid Pro cell renderer attributes CVSS 4.0HIGH 8.5

See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences