# 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.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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:** Yes
- **Published:** 25 May 2026
- **Updated:** 26 May 2026
- **Also known as:** CLEANSTART-2026-FL24819, GHSA-fgmj-fm8m-jvvx, MINI-2659-pcpv-2jqm, MINI-5cq4-8vh6-273w, MINI-pqf3-q2p9-pmqg

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-45249?

2 open source packages ship an affected version, including echarts. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `echarts` | npm | All versions | 6.1.0 |
| `echarts` | npm | All versions | 6.1.0 |

Products: Apache Echarts.

## How do I fix CVE-2026-45249?

Upgrade echarts to 6.1.0 or later.

## Is CVE-2026-45249 being exploited?

There is no known exploitation of CVE-2026-45249 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45249 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-45249 in the wild and no public exploit code.

Affected packages and fixed versions:
- echarts (npm): affected all versions; fixed in 6.1.0
- echarts (npm): affected all versions; fixed in 6.1.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45249/ (Markdown: https://insights.sbomify.com/CVE-2026-45249/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45249
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45249
- OSV: https://osv.dev/vulnerability/CVE-2026-45249

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45249/
Summaries are generated and may contain mistakes; the official description above is the record.