The Groundhogg plugin for WordPress, used for CRM, newsletters, and marketing automation, contains an unrestricted file upload vulnerability (CWE-434) in the gh_big_file_upload() function. This vulnerability allows authenticated users with Author-level privileges or higher to upload arbitrary files without proper validation of file types. Exploiting this flaw could enable remote code execution on the server hosting the plugin. The issue affects all versions up to and including 3.7.3.5. The CVSS 3.1 base score is 8.8, reflecting network attack vector, low attack complexity, required privileges at the Author level, no user interaction, and high impact on confidentiality, integrity, and availability.

An authenticated attacker with Author-level access or above can upload arbitrary files to the server, potentially leading to remote code execution. This compromises the confidentiality, integrity, and availability of the affected system. The vulnerability poses a high risk to sites using the vulnerable versions of the Groundhogg plugin.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Author-level access to trusted users only and consider disabling or limiting file upload capabilities in the plugin if possible. Monitor for vendor updates and apply patches promptly once released.