The vulnerability identified as CVE-2026-28066 affects the ThemeREX Legrand WordPress theme (versions up to 2.17). It arises from improper validation or control of filenames used in PHP include or require statements, enabling PHP Local File Inclusion. This can allow an attacker to execute arbitrary local files on the server, potentially leading to full compromise of the affected system. The CVSS 3.1 base score is 8.1, reflecting network attack vector, high complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. No patch or vendor advisory is currently available to confirm remediation status.

Successful exploitation of this vulnerability could allow an unauthenticated attacker to include and execute arbitrary local files on the server running the vulnerable ThemeREX Legrand theme. This may lead to disclosure of sensitive information, modification of data, or denial of service. The high CVSS score reflects the critical nature of these impacts. 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 vulnerable theme or restricting access to the affected web application to trusted users only. Monitor official ThemeREX channels for updates and apply patches promptly once available.