This vulnerability arises from improper limitation of pathname in the campaign import feature of Mautic 7.0.0. When extracting uploaded ZIP files, the validation logic fails to restrict file paths, enabling an authenticated user with campaign import privileges (campaign:imports:create) to write arbitrary PHP files to sensitive system directories. Successful exploitation can overwrite critical internal configuration or cache components, resulting in remote code execution with the privileges of the web server user. The CVSS 3.1 base score is 9.9, reflecting its critical severity with network attack vector, low attack complexity, and no user interaction required.

An attacker with valid campaign import privileges can achieve remote code execution on the affected system by writing malicious PHP files to sensitive directories. This compromises confidentiality, integrity, and availability of the system, potentially allowing full control under the web server user context.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict campaign import privileges to trusted users only and monitor for suspicious activity related to file uploads and campaign imports.