CVE-2025-66648
High
Description
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductVega-functions
PublishedJan 5, 2026
First seenJan 5, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- vega-functions_project vega-functions6.1.1 or later
- vega-functions6.1.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vega-functions_project vega-functions | v < 6.1.1 | 6.1.1 |
| vega-functionsnpm | v < 6.1.1 | 6.1.1 |
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