Highcharts Core: `javascript:` URL in an `xlink:href` attribute survives text filtering and reaches exported charts

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Highcharts JS is a JavaScript charting library based on SVG. From 10.3.2 until 11.4.9, 12.6.2, and 13.1.1, Highcharts accepts an SVG anchor xlink:href attribute without applying the allowed-scheme check used for href and src. An attacker who controls a chart text option can preserve a javascript URL in serialized chart output. When exported or server-rendered SVG is parsed again and a user activates the link, script runs in the origin of that document. This issue is fixed in 11.4.9, 12.6.2 and 13.1.1.

Source published

28 Oct 2026 17:23:02 UTC

Source modified

29 Oct 2026 18:34:59 UTC

Observed here

29 Oct 2026 19:28:49 UTC

Source terms

CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 7.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

Highcharts JS is a JavaScript charting library based on SVG. From 10.3.2 until 11.4.9, 12.6.2, and 13.1.1, Highcharts accepts an SVG anchor xlink:href attribute without applying the allowed-scheme check used for href and src. An attacker who controls a chart text option can preserve a javascript URL in serialized chart output. When exported or server-rendered SVG is parsed again and a user activates the link, script runs in the origin of that document. This issue is fixed in 11.4.9, 12.6.2 and 13.1.1.

Source published

Oct 28, 2026, 5:23:02 PM (timezone not stated)

Source modified

Oct 29, 2026, 6:34:59 PM (timezone not stated)

Observed here

6 Nov 2026 00:43:19 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 4.0 · 7.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

Highcharts JS is a JavaScript charting library based on SVG. From 10.3.2 until 11.4.9, 12.6.2, and 13.1.1, Highcharts accepts an SVG anchor xlink:href attribute without applying the allowed-scheme check used for href and src. An attacker who controls a chart text option can preserve a javascript URL in serialized chart output. When exported or server-rendered SVG is parsed again and a user activates the link, script runs in the origin of that document. This issue is fixed in 11.4.9, 12.6.2 and 13.1.1.

Source published

28 Oct 2026 18:17:14 UTC

Source modified

29 Oct 2026 19:17:18 UTC

Observed here

5 Nov 2026 23:38:43 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 7.2 CVSS:4.0/AV:N/AC:L/AT:P/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

### Impact The filter applied to markup in text options checks `href`, `src` and a few similar attributes against an allowed-scheme list, but accepts `xlink:href` without that check, so an SVG anchor whose `xlink:href` is a `javascript:` URL passes the filter, whether or not the option is rendered with `useHTML`. In the live page the attribute is written without the XLink namespace, so browsers do not treat the anchor as a link there. The attribute is preserved verbatim in the chart's serialised output: the SVG produced by the exporting module, including the default SVG download, declares the XLink namespace and contains the anchor, and so does the markup of the chart container. Any document that parses that output again, such as the downloaded SVG opened in a browser or a page that inlines exported or server-rendered chart markup, then holds a working link, and an attacker who controls the chart configuration can thereby run script in the origin of that document when a user activates the link. Exploitation requires that untrusted data reach a text option such as the title, that the chart be exported or its markup be serialised and parsed again, and that a user activate the link. ### Workarounds Drop-in fix for all affected versions (10.3.2 - 13.1.0). Add the below IIFE to run after Highcharts is loaded, before creating a chart. ``` !function(t){var e=t&&t.AST;if(e&&"function"==typeof e.filterUserAttributes&&!e.xlinkHrefPatched){var r=e.filterUserAttributes,n=Object.prototype.hasOwnProperty;e.filterUserAttributes=function(t){return t&&n.call(t,"xlink:href")&&!o(t["xlink:href"])&&delete t["xlink:href"],r.call(this,t)},e.xlinkHrefPatched=!0}function o(t){var r=e.allowedReferences||["https://","http://","mailto:","/","../","./","#"];return"string"==typeof t&&r.some(function(e){return 0===t.indexOf(e)})}}(Highcharts); ``` ### Obtaining the patched version The patched releases are available from all the usual distribution channels. With npm, upgrade the affected package to the patched version listed above, for example `npm install [email protected]`. If you load Highcharts from the CDN, use the versioned URLs on code.highcharts.com, for example `https://code.highcharts.com/13.1.1/highcharts.js`. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/getting-started/installation).

Source published

28 Oct 2026 19:55:10 UTC

Source modified

28 Oct 2026 20:15:05 UTC

Observed here

28 Oct 2026 20:55:42 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

Publisher rating · HIGH