Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-118243— Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototype`

Quick assessment

Affected
highcharts highcharts
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Highcharts JS 是一个基于 SVG 的 JavaScript 图表库。在 1.0.0 至 4.2.2 版本中，Highcharts Dashboards 将 DataCursor 监听器及其状态映射存储在以 DataTable ID 为键的普通对象中。若通过 dataPool 连接器配置传入一个以 为前缀的表 ID，该 ID 将解析为 ；此时，同步注册机制会在 上创建一个可枚举属性，其属性名后缀可通过同步组（sync group）选项进行操控。该属性对所有对象均可见，且持久的同步状态可能引发异常，导致诸

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
highcharts highcharts >= 1.0.0, < 4.2.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-118243

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototype`
Source: CVE Program / CVE List V5
Vulnerability Description
Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards stores DataCursor listener and state maps in plain objects keyed by DataTable ID. A __proto__ table ID supplied through dataPool connector configuration resolves to Object.prototype, and sync registration creates an enumerable property there whose suffix can be influenced through the sync group option. The property is visible on every object, and lasting sync states can throw and stop features such as extremes synchronization. Exploitation requires untrusted dashboard configuration and an enabled component sync, but no user interaction beyond loading the board. This issue is fixed in 4.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
highcharts highcharts >= 1.0.0, < 4.2.2 -

II. Public POCs for CVE-2026-118243

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-118243

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-118243 (1)

Vendor Advisories for CVE-2026-118243 (1)

Vendor Pages for CVE-2026-118243 (1)

Same Patch Batch · highcharts · 2026-10-28 · 16 CVEs total

CVE-2026-118245 8.6 HIGH Highcharts Dashboards: `chartConstructor` is an unchecked lookup into the Highcharts names
CVE-2026-118254 8.6 HIGH Highcharts Grid: pagination language options are parsed as HTML
CVE-2026-116797 8.5 HIGH Highcharts Grid Pro: cell-renderer `attributes` map written with raw `setAttribute`
CVE-2026-118242 8.5 HIGH Highcharts Grid: custom icon definition objects written with raw `setAttribute` on `<path>
CVE-2026-118246 8.4 HIGH Highcharts Core: `breadcrumbs.style` keys become SVG event-handler attributes
CVE-2026-118253 8.4 HIGH Highcharts Dashboards: fullscreen labels are parsed as HTML
CVE-2026-118251 8.4 HIGH Highcharts: javascript: URL in credits.href runs script on click
CVE-2026-118252 8.4 HIGH Highcharts Dashboards: sidebar component labels are parsed as HTML
CVE-2026-118255 8.4 HIGH Highcharts Grid: javascript: URL in credits.href runs script on click
CVE-2026-116796 7.2 HIGH Highcharts Core: `javascript:` URL in an `xlink:href` attribute survives text filtering an
CVE-2026-118244 7.2 HIGH Highcharts Core: AST `DOMParser` fallback assigns unsanitized markup to `innerHTML` during
CVE-2026-118250 7.2 HIGH Highcharts: dotted series.keys paths write to Object.prototype
CVE-2026-118249 7.2 HIGH Highcharts: series column construction writes to Object.prototype
CVE-2026-118247 6.9 MEDIUM Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__`
CVE-2026-118248 6.9 MEDIUM Highcharts Dashboards: editableOptions.propertyPath writes to Object.prototype

IV. Related Vulnerabilities

Same product: highcharts
Same vendor: highcharts
Same weakness: CWE-1321