Joomlack Page Builder Improper Access Control Vulnerability
Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.
Quick answer
Joomlack Page Builder should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
Joomlack Page Builder is affected by an unauthenticated arbitrary file upload issue that can lead to remote code execution. Update or remove the extension, block PHP execution in upload paths, and inspect the Joomla site for webshells. Any publicly exposed vulnerable site should be reviewed as a possible full compromise.
- Inventory Joomla sites using Joomlack Page Builder and record the installed extension version.
- Upgrade to the fixed Joomlack release or remove the extension until a fixed version is installed.
- Restrict file upload functionality and block executable file types at the application, web server, and WAF layers.
- Disable PHP execution in images, media, cache, tmp, upload, and other user-writable directories.
- Inspect web roots, uploaded files, templates, plugins, administrator users, and configuration files for webshells or unauthorized changes.
- Rotate Joomla administrator, FTP, SSH, database, and API credentials if suspicious uploads are found.
- Clear Joomla cache, CDN cache, and server opcache after removing malicious files and updating the extension.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm the Page Builder extension version is fixed or the vulnerable extension is removed.
- Validate unauthenticated users cannot upload files or execute PHP through upload paths.
- Review web server, Joomla, and WAF logs for upload and execution attempts.
- Test legitimate page builder and media workflows after remediation.
- Run a Fixnx scan and confirm the public Joomla site no longer exposes vulnerable upload behavior.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-56290?
Joomlack Page Builder should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.