CVE-2026-28068 is a Local File Inclusion (LFI) vulnerability found in the ThemeREX Rhythmo WordPress theme, specifically in versions up to and including 1.3.4. The vulnerability arises from improper validation and control of filenames used in PHP include or require statements. This flaw allows an attacker to manipulate the filename parameter to include arbitrary local files from the server's filesystem. Exploiting this vulnerability can lead to disclosure of sensitive files such as configuration files, password files, or source code, which may contain credentials or other critical information. Additionally, in some configurations, LFI can be leveraged to execute arbitrary code if combined with other vulnerabilities or log poisoning techniques. The vulnerability does not require authentication, making it accessible to unauthenticated remote attackers who can interact with the vulnerable endpoint. Although no public exploits have been reported yet, the nature of LFI vulnerabilities and their common exploitation in WordPress themes and plugins make this a significant risk. The lack of a CVSS score indicates that the vulnerability is newly published and awaiting further analysis or patching. The vulnerability affects a widely used CMS ecosystem, increasing the potential attack surface globally.

The impact of CVE-2026-28068 is considerable for organizations using the ThemeREX Rhythmo theme on WordPress sites. Successful exploitation can lead to unauthorized disclosure of sensitive files, including configuration files containing database credentials or API keys, which can compromise the entire web application and backend systems. Attackers may also use this vulnerability as a foothold to escalate privileges or pivot within the network. The confidentiality and integrity of data are at high risk, and availability could be indirectly affected if attackers disrupt services or deploy malware. Since WordPress powers a significant portion of websites globally, and ThemeREX Rhythmo is a commercial theme with a user base across multiple countries, the scope of affected systems is broad. The ease of exploitation without authentication increases the threat level, potentially enabling widespread automated scanning and attacks. Organizations that rely on this theme for business-critical websites or e-commerce platforms face reputational damage, financial loss, and regulatory compliance risks if exploited.

To mitigate CVE-2026-28068, organizations should immediately verify if they are using the ThemeREX Rhythmo theme version 1.3.4 or earlier and plan to update to a patched version once released by the vendor. In the interim, restrict file inclusion paths by hardcoding allowed include directories and validating input parameters rigorously to prevent arbitrary file inclusion. Employ web application firewalls (WAFs) with rules specifically targeting LFI attack patterns to block malicious requests. Disable unnecessary PHP functions such as 'allow_url_include' and ensure 'open_basedir' restrictions are properly configured to limit file access. Regularly audit and monitor web server logs for suspicious activity indicative of LFI attempts. Additionally, implement the principle of least privilege on the web server and file system to minimize the impact of potential exploitation. Backup website data and configurations regularly to enable quick recovery if an incident occurs. Finally, educate development and security teams about secure coding practices to prevent similar vulnerabilities in custom themes or plugins.