An issue was discovered in Squiz Matrix from 5.3 through to 5.3.6.1 and 5.4.1.3. An information disclosure caused by a Path Traversal issue in the 'File Bridge' plugin allowed the existence of files outside of the bridged path to be confirmed.

An issue was discovered in Squiz Matrix before 5.3.6.1 and 5.4.x before 5.4.1.3. There are multiple reflected Cross-Site Scripting (XSS) issues in Matrix WYSIWYG plugins.

An issue was discovered in Squiz Matrix before 5.3.6.1 and 5.4.x before 5.4.1.3. Authenticated users with permissions to edit design assets can cause Remote Code Execution (RCE) via a maliciously crafted time_format tag.

Squiz Matrix CMS 6.20 is vulnerable to an Insecure Direct Object Reference caused by failure to correctly validate authorization when submitting a request to change a user's contact details. NOTE: this is disputed by both the vendor and the original discoverer because it is a site-specific finding, not a finding about the Squiz Matrix CMS product.

An issue was discovered in core/assets/form/form_question_types/form_question_type_file_upload/form_question_type_file_upload.inc in Squiz Matrix CMS 5.5.0 prior to 5.5.0.3, 5.5.1 prior to 5.5.1.8, 5.5.2 prior to 5.5.2.4, and 5.5.3 prior to 5.5.3.3 where a user can delete arbitrary files from the server during interaction with the File Upload field type, when a custom form exists. (This is related to an information disclosure issue within the File Upload field type that allows users to view the full path to uploaded files, including the product's web root directory.)

An issue was discovered in Squiz Matrix CMS 5.5.0 prior to 5.5.0.3, 5.5.1 prior to 5.5.1.8, 5.5.2 prior to 5.5.2.4, and 5.5.3 prior to 5.5.3.3 where a user can trigger arbitrary unserialization of a PHP object from a packages/cms/page_templates/page_remote_content/page_remote_content.inc POST parameter during processing of a Remote Content page type. This unserialization can be used to trigger the inclusion of arbitrary files on the filesystem (local file inclusion), and results in remote code execution.