CVE-2026-78076

An Open Redirect vulnerability was found in Helix Ultimate for Joomla (versions < 2.2.10) via the Base64 return parameter. Redirect parameters accept arbitrary Base64 strings without verifying if the target is an internal URL.

In Helix Ultimate for Joomla before 2.2.10, a privileged file upload bypass via content spoofing was found. Previously only file extension and basic size were validated, allowing non-image files with raster extensions to be uploaded. Strict MIME verification and GD binary raster decoding were added to reject invalid images.

In Helix Ultimate for Joomla before 2.2.10, a stored XSS vulnerability was found in the MegaMenu layout. Unsanitized column and item configuration values were rendered without complete contextual escaping, allowing injection of malicious HTML/JS. Stricter sanitization and tag allowlists were implemented.

A broken object-level authorization vulnerability was found in Helix Ultimate for Joomla (versions < 2.2.10) in blog image deletion. Blog::remove_image() checks if the user is authorized to edit the article, but does not verify if the image path belongs to that article. On Joomla 3 builds, an author can delete arbitrary files under /images/.

The Joomla extension Helix Ultimate below version 2.2.7 is vulnerable to unauthenticated arbitrary file deletion. An attacker without logging in can delete any file on the server.

The Joomla extension Helix Ultimate before version 2.2.7 is vulnerable to unauthenticated stored XSS. An attacker can inject malicious script without authentication.