Is this vulnerability remotely exploitable across the internet?

Yes, if an application exposes interfaces where remote users can supply or influence Vega expressions, a remote attacker can craft a payload that triggers XSS when the visualization is rendered in a victim's browser.

What level of access does an attacker need?

The attacker must be able to control or modify data that is fed into the Vega expression engine—such as report definitions, saved dashboards, shared visualization specs, or any user-editable configuration that the application passes to Vega.

What is the safest general fix pattern?

The safest pattern is to strictly separate internal implementation functions from the public expression surface, exposing only a small, vetted set of safe operations. Any function capable of evaluating arbitrary JavaScript or interacting with the host environment should be inaccessible to untrusted expressions.

Severity:

HIGH RISK

(7.2)

Cross-Site Scripting (CWE-79) via Internal Expression Function in vega-functions

CVE-2025-66648

Published:

Jan 5, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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CRITICAL RISK

CRITICAL

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Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Client-Side Code Execution / Cross-Site Scripting

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Client-Side Code Execution / Cross-Site Scripting

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Cross-Site Scripting (CWE-79) via Internal Expression Function in vega-functions

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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