The vulnerability CVE-2026-28087 in ThemeREX Filmax arises from improper validation of filenames used in PHP include or require statements, resulting in a Local File Inclusion (LFI) issue. This allows an attacker to potentially include local files on the server, which can lead to arbitrary code execution or disclosure of sensitive information. The affected versions are up to 1.1.11. The CVSS 3.1 base score is 8.1, reflecting network attack vector, high attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to include and execute arbitrary local files on the server running the vulnerable Filmax version. This can lead to full compromise of the affected system, including data disclosure, modification, or denial of service. No known exploits in the wild have been reported yet.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor ThemeREX communications for updates. In the meantime, restricting access to vulnerable endpoints and applying web application firewall rules to block suspicious include parameters may help mitigate risk.