CVE-2026-3651 Missing authorization in Build App Online
Unauthenticated attackers can modify the author of arbitrary posts in the Build App Online WordPress plugin due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3651?
CVE-2026-3651 is a medium-severity missing authorization vulnerability in hakeemnala Build App Online, published on 21 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-3651?
How do I fix CVE-2026-3651?
No fix has been published for CVE-2026-3651 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-3651 being exploited?
There is no known exploitation of CVE-2026-3651 in the wild and no public exploit code.
Sources
Also known as GHSA-xcmm-m27h-87pr.