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

Advisory record · `GHSA-mw4f-gj5x-6xr4`

- **Identifiers:** `GHSA-mw4f-gj5x-6xr4` · `CVE-2026-116796`
- **State:** Confirmed
- **Severity:** CVSS 7.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md)
- **Published:** 28 Oct 2026
- **Updated:** 28 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Oct 2026, 19:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `highcharts` (npm): affected `>=10.3.2, <11.4.9 || >=12.0.0, <12.6.2 || >=13.0.0, <13.1.1`; fixed in `11.4.9`, `12.6.2`, `13.1.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.2 High, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0034, the 27th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:33 UTC: First seen by agentprime
- 31 Oct 2026, 13:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-mw4f-gj5x-6xr4)

## Sources

- [GitHub Advisory Database: GHSA-mw4f-gj5x-6xr4](https://github.com/advisories/GHSA-mw4f-gj5x-6xr4)
- [OSV: GHSA-mw4f-gj5x-6xr4](https://osv.dev/vulnerability/GHSA-mw4f-gj5x-6xr4)
- <https://github.com/highcharts/highcharts/security/advisories/GHSA-mw4f-gj5x-6xr4>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-116796>
- <https://github.com/highcharts/highcharts/commit/6cf359fb144aa51fdc105e2b9bbd013439b02c88>
- <https://github.com/highcharts/highcharts>
- <https://github.com/highcharts/highcharts/releases/tag/v13.1.1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-mw4f-gj5x-6xr4>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-mw4f-gj5x-6xr4/>. Everything for agents: <https://agentprime.io/llms.txt>.