What is CVE-2025-59840?

CVE-2025-59840 is a high-severity vulnerability in Vega, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2025-11-13.

How severe is CVE-2025-59840?

High severity. CVSS v3 base score is 8.1 out of 10.

XSS in Vega

CVE-2025-59840

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. In Vega prior to version 6.2.0, applications meeting 2 conditions are at risk of arbitrary JavaScript code execution…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (25.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Vega — versions vega < 6.2.0, vega-expression >= 6.0.0, < 6.1.0, vega-expression < 5.2.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-59840?: CVE-2025-59840 is a high-severity vulnerability in Vega, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2025-11-13.
How severe is CVE-2025-59840?: High severity. CVSS v3 base score is 8.1 out of 10.