CVE-2026-28107 is a Local File Inclusion (LFI) vulnerability found in the ThemeREX Muzicon WordPress theme, affecting versions up to 1.9.0. The vulnerability stems from improper control of the filename parameter used in PHP include or require statements. Specifically, the theme fails to adequately validate or sanitize user input that determines which files are included during execution. This flaw allows an attacker to manipulate the input to include arbitrary files from the server's filesystem. Exploiting this vulnerability can lead to disclosure of sensitive files such as configuration files, password files, or other critical data stored on the server. In some cases, it may also enable remote code execution if an attacker can upload malicious files to the server and then include them via the vulnerable parameter. Although no known public exploits have been reported yet, the vulnerability is significant due to the widespread use of WordPress and the popularity of ThemeREX Muzicon. The lack of a CVSS score indicates that the vulnerability is newly published and awaiting further analysis. The vulnerability does not require authentication or user interaction, increasing its risk profile. The issue was reserved on February 25, 2026, and published on March 5, 2026, by Patchstack. No patches or fixes have been linked yet, so users must monitor for updates or apply manual mitigations. This vulnerability is categorized under improper input validation leading to insecure file inclusion, a common and dangerous web application security flaw.

The impact of CVE-2026-28107 is substantial for organizations using the affected Muzicon theme versions. Successful exploitation can lead to unauthorized disclosure of sensitive server files, including configuration files containing database credentials or API keys. This exposure can facilitate further attacks such as privilege escalation, data theft, or full server compromise. Additionally, if an attacker can upload files to the server, they may execute arbitrary code by including these files, resulting in remote code execution. This can lead to complete loss of confidentiality, integrity, and availability of the affected web server and its hosted applications. Organizations with public-facing WordPress sites using Muzicon are particularly vulnerable, potentially impacting customer data, business operations, and reputation. The absence of authentication requirements and user interaction lowers the barrier for exploitation, increasing the threat level. While no known exploits are currently in the wild, the vulnerability’s nature and ease of exploitation make it a critical risk once weaponized. The threat is especially relevant for industries relying heavily on WordPress for their web presence, including e-commerce, media, and professional services.

To mitigate CVE-2026-28107, organizations should take the following specific actions: 1) Immediately identify all WordPress installations using the ThemeREX Muzicon theme and verify the version; 2) Monitor ThemeREX and WordPress security advisories for an official patch or update addressing this vulnerability and apply it promptly upon release; 3) If no patch is available, perform a manual code review of the theme files to locate include or require statements that use user-controlled input and implement strict validation or sanitization to restrict included filenames to a safe whitelist; 4) Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious requests attempting to exploit file inclusion parameters; 5) Restrict file permissions on the server to limit access to sensitive files and directories, reducing the impact of potential file inclusion; 6) Regularly back up website data and configurations to enable rapid recovery in case of compromise; 7) Conduct security awareness training for administrators to recognize signs of exploitation and maintain strong credential hygiene; 8) Consider isolating WordPress instances in containerized or sandboxed environments to limit lateral movement if exploited. These targeted steps go beyond generic advice by focusing on immediate detection, containment, and prevention specific to the nature of this LFI vulnerability.