MatrixAddons Easy Invoice versions up to 2.1.4 contain a vulnerability due to improper control of filenames used in PHP include/require statements, classified as a PHP Local File Inclusion issue. This flaw allows an attacker with high privileges to include arbitrary local files, which can lead to execution of malicious code or disclosure of sensitive information. The vulnerability is network exploitable but requires high attack complexity and privileges, with no user interaction needed. The CVSS 3.1 vector is AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H, reflecting high impact on confidentiality, integrity, and availability. No patch or vendor advisory is currently available.

Successful exploitation of this vulnerability can lead to full compromise of the affected system's confidentiality, integrity, and availability by allowing an attacker to include and execute arbitrary local files. This can result in unauthorized access to sensitive data, code execution, and service disruption. However, exploitation requires high privileges and network access, which limits the attack surface. There are no known active exploits in the wild.

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 application to trusted users only and monitor for suspicious activity. Avoid exposing the vulnerable application to untrusted networks. Do not rely on generic mitigations unless specifically recommended by the vendor.