The vulnerability CVE-2026-28012 in ThemeREX Gridiron theme arises from improper validation or control of filenames used in PHP include or require statements. This allows an attacker to perform Local File Inclusion (LFI), which can lead to arbitrary file execution on the server. The issue affects all versions up to 1.0.14. The CVSS v3.1 base score is 8.1, indicating high severity with network attack vector, high attack complexity, no privileges required, no user interaction, and impacts on confidentiality, integrity, and availability. No patch or official fix details are currently available.

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to include local files on the server, potentially leading to disclosure of sensitive information, code execution, and full system compromise. The high CVSS score reflects significant impact on confidentiality, integrity, and availability. However, 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 released, users should consider disabling or removing the affected theme or restricting access to vulnerable endpoints as a temporary mitigation. Monitor official ThemeREX communications for updates regarding patches or workarounds.