CVE-2026-25326 identifies a Local File Inclusion (LFI) vulnerability in the CMSMasters Content Composer plugin for WordPress, specifically versions up to 1.4.5. The vulnerability arises from improper control over the filename parameter used in PHP include or require statements, which allows an attacker to manipulate the file path and include arbitrary files from the server. This can lead to disclosure of sensitive files such as configuration files, password files, or application source code, and in some cases, may enable remote code execution if combined with other vulnerabilities or misconfigurations. The vulnerability is classified as a PHP Remote File Inclusion type but is technically a Local File Inclusion since the description specifies local files. No CVSS score has been assigned yet, and no known exploits are reported in the wild, but the flaw is publicly disclosed and published as of February 2026. The plugin is commonly used in WordPress environments to build and manage content, making it a valuable target for attackers seeking to compromise websites. The lack of patch links indicates that a fix may not yet be available, increasing the urgency for mitigation through alternative means such as input validation or disabling the plugin until patched.

For European organizations, exploitation of this vulnerability could lead to unauthorized access to sensitive internal files, leakage of credentials or configuration data, and potential website defacement or takeover. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR violations due to data exposure), and disrupt business operations. Since WordPress powers a significant portion of websites in Europe, and CMSMasters Content Composer is a popular plugin, the attack surface is substantial. Attackers could leverage this vulnerability to pivot into internal networks or deploy malware, impacting confidentiality, integrity, and availability of systems. The absence of authentication requirements for exploitation increases risk, especially for public-facing websites. Organizations in sectors such as finance, healthcare, and government are particularly at risk due to the sensitivity of data handled and the criticality of their web presence.

Immediate mitigation steps include disabling the CMSMasters Content Composer plugin until a security patch is released. Organizations should monitor official vendor channels for updates and apply patches promptly once available. In the interim, implement strict input validation and sanitization on all user-supplied parameters related to file inclusion. Employ Web Application Firewalls (WAFs) with rules designed to detect and block attempts to exploit LFI vulnerabilities, such as suspicious file path traversal patterns. Conduct thorough audits of web server and application logs to identify any anomalous access patterns. Restrict file permissions on the server to limit access to sensitive files and directories. Additionally, consider isolating the web server environment to minimize the impact of a successful exploit. Regularly back up website data and configurations to enable rapid recovery if compromise occurs.