CVE-2026-45249 Apache ECharts: XSS in Lines series tooltip rendering
Attackers can execute arbitrary scripts via XSS in Apache ECharts Lines series tooltips when specific rendering conditions are met.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-45249?
CVE-2026-45249 is a medium-severity cross-site scripting vulnerability in Apache ECharts, published on 25 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A cross-site scripting (XSS) vulnerability exists in Apache ECharts in the Lines series tooltip rendering logic.
This issue affects Apache ECharts: from before 6.1.0.
In versions prior to 6.1.0, if both Lines series and tooltip are used, and no user-specified tooltip.formatter is provided, and series.data[i].name is specified, raw HTML string series.data[i].name can be rendered through innerHTML sink into tooltip content. Although tooltip is allowed to accept user-provided raw HTML via a custom tooltip.formatter, the built-in tooltip formatters conventionally perform HTML escaping automatically. This case breaks that convention and may unexpectedly lead to script execution when tooltips are displayed.
Users are recommended to upgrade to version 6.1.0 if using the Lines series in this way, which fixes the issue.
Weakness: CWE-79
Which versions are affected by CVE-2026-45249?
2 open source packages ship an affected version, including echarts. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
echarts npm | All versions | 6.1.0 |
echarts npm | All versions | 6.1.0 |
Products include Apache Echarts.
How do I fix CVE-2026-45249?
Upgrade echarts to 6.1.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-45249 being exploited?
There is no known exploitation of CVE-2026-45249 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-FL24819, GHSA-fgmj-fm8m-jvvx, MINI-2659-pcpv-2jqm, MINI-5cq4-8vh6-273w, MINI-pqf3-q2p9-pmqg.