CVE-2025-66648 HIGH

CVE-2025-66648: `vega-functions` vulnerable to Cross-site Scripting via `setdata` function

Vendor Vega
Product vega
Weakness CWE-79 · XSS
Published January 5, 2026
Last update January 6, 2026
View on NVD All CVEs

CVSS base score

7.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 5, 2026 CVE published
January 6, 2026 Record updated