CVE-2026-28027 is a Local File Inclusion (LFI) vulnerability found in the ThemeREX Kayon WordPress theme, specifically affecting versions up to 1.3. The vulnerability arises from improper control over the filename parameter used in PHP include or require statements. This flaw allows an attacker to manipulate the input to include arbitrary files from the local filesystem, potentially leading to the execution of malicious code or disclosure of sensitive information. The vulnerability is classified as a PHP Remote File Inclusion type but technically enables Local File Inclusion, which can be leveraged for remote code execution if combined with other weaknesses or file upload capabilities. The issue was reserved in late February 2026 and published in early March 2026, with no CVSS score assigned yet and no known exploits in the wild. The lack of patch links suggests that a fix may not be publicly available at the time of reporting. Exploitation typically requires no authentication, increasing the risk profile. The vulnerability affects the Kayon theme, a product of ThemeREX, which is used by WordPress sites globally. Attackers exploiting this vulnerability can execute arbitrary PHP code, read sensitive files, or escalate privileges, potentially compromising the entire web server and connected infrastructure.

The impact of CVE-2026-28027 is significant for organizations using the ThemeREX Kayon theme. Successful exploitation can lead to unauthorized disclosure of sensitive data, including configuration files, credentials, and user data. Attackers may execute arbitrary code on the affected server, leading to full system compromise, data manipulation, or service disruption. This can result in defacement, data breaches, ransomware deployment, or use of the compromised server as a pivot point for further attacks within the network. The vulnerability’s ease of exploitation without authentication increases the risk of automated attacks and widespread exploitation once public exploit code becomes available. Organizations relying on Kayon for their WordPress sites face reputational damage, regulatory penalties, and operational downtime if exploited. The threat is particularly acute for high-profile websites, e-commerce platforms, and organizations with sensitive customer data hosted on vulnerable installations.

1. Immediately monitor official ThemeREX channels for security patches or updates addressing CVE-2026-28027 and apply them promptly. 2. In the absence of an official patch, implement strict input validation and sanitization on all user-controllable parameters that influence file inclusion paths to prevent manipulation. 3. Disable PHP functions that facilitate file inclusion or execution (e.g., include, require) from untrusted sources where feasible. 4. Employ Web Application Firewalls (WAFs) with rules designed to detect and block LFI attack patterns targeting the Kayon theme. 5. Restrict file system permissions to limit the web server’s access to sensitive files and directories, minimizing the impact of potential inclusion. 6. Conduct regular security audits and code reviews of customizations to the theme to identify and remediate insecure coding practices. 7. Educate site administrators on the risks and encourage immediate action upon vulnerability disclosures. 8. Consider isolating WordPress instances or using containerization to limit lateral movement in case of compromise.