CVE-2025-66648: Vega-Functions Project Vega-Functions

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

vega-functions provides function implementations for the Vega expression language. Prior to version 6.1.1, for sites that allow users to supply untrusted user input, malicious use of an internal function (not part of the public API) could be used to run unintentional javascript (XSS). This issue is fixed in vega-functions `6.1.1`. There is no workaround besides upgrading. Using `vega.expressionInterpreter` as described in CSP safe mode does not prevent this issue.

Affected products

• Vega-Functions Project Vega-Functions: before 6.1.1 (fixed in 6.1.1)

Published 2026-01-05. Last modified 2026-06-17.