The plugin is vulnerable to PHP Object Injection in versions up to and including, 2.6.3 via deserialization of untrusted input in the import function via the 'shortcode' parameter. This allows authenticated attackers, with administrator-level access to inject a PHP Object. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

The Logo Carousel WordPress plugin before 3.4.2 allows users with a role as low as Contributor to duplicate and view arbitrary private posts made by other users via the Carousel Duplication feature

The Logo Carousel WordPress plugin before 3.4.2 does not validate and escape the "Logo Margin" carousel option, which could allow users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks