This vulnerability involves improper control of the filename parameter in PHP include or require statements within the Client Invoicing by Sprout Invoices plugin by BoldGrid. It allows PHP Local File Inclusion (LFI), which can lead to arbitrary code execution or disclosure of sensitive information. The affected versions are up to 20.8.9. The CVSS v3.1 base score is 7.2, indicating high severity, with network attack vector, low attack complexity, requiring high privileges, no user interaction, and impacts on confidentiality, integrity, and availability.

Successful exploitation could allow an attacker with high privileges to include local files on the server, potentially leading to arbitrary code execution, data disclosure, and disruption of service. The vulnerability impacts confidentiality, integrity, and availability of the affected system. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the affected plugin and limit user privileges to reduce risk. Monitor vendor channels for updates and apply patches promptly once released.