The vulnerability CVE-2026-28077 affects ThemeREX Vapester versions up to 1.1.10 and arises from improper validation of filenames used in PHP include or require statements. This can lead to Local File Inclusion (LFI), where an attacker may cause the application to load unintended files from the server. 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 attacker to read or execute arbitrary files on the affected server, potentially leading to full compromise of the web application and underlying system. The high CVSS score indicates significant impact on confidentiality, integrity, and availability of the affected system.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling or restricting vulnerable functionality or applying other protective controls as recommended by ThemeREX once published.