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.

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.

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 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.

Multiple cross-site scripting (XSS) vulnerabilities in char_map.php in MySource Matrix 3.28.3 allow remote attackers to inject arbitrary web script or HTML via the (1) height or (2) width parameter.

MySource Matrix after 3.8 allows remote attackers to use the application as an HTTP proxy server via a MIME encoded URL in the sq_content_src parameter to access arbitrary sites with the server's IP address and conduct cross-site scripting (XSS) attacks. NOTE: the researcher reports that "The vendor does not consider this a vulnerability.

MySource Matrix 3.8 and earlier, and MySource 2.x, allow remote attackers to use the application as an HTTP proxy server via the sq_remote_page_url parameter to access arbitrary sites with the server's IP address and conduct cross-site scripting (XSS) attacks. NOTE: the researcher reports that "The vendor does not consider this a vulnerability.

Unspecified vulnerability in MySource Classic 2.14.6, and possibly earlier, allows remote authenticated users, with superuser privileges, to inject arbitrary PHP code via unspecified vectors related to the Equation attribute in Web_Extensions - Notitia (I/II). NOTE: due to lack of details, it is not clear whether this issue is file inclusion, static code injection, or another type of issue.