CVE-2025-59558 is a Local File Inclusion (LFI) vulnerability found in the ThemeMove Billey WordPress theme versions before 2.1.6. The vulnerability arises from improper control of the filename parameter used in PHP include or require statements. This flaw allows an attacker to manipulate the filename input to include arbitrary files from the server's filesystem. Exploiting this vulnerability can lead to unauthorized disclosure of sensitive files, such as configuration files containing database credentials, or even enable remote code execution if combined with other vulnerabilities or writable file locations. The vulnerability does not require authentication, making it accessible to unauthenticated attackers. Although no public exploits are currently known, the widespread use of WordPress and the popularity of the Billey theme increase the risk of exploitation. The absence of a CVSS score indicates the need for an expert severity assessment, which here is considered high due to the potential impact and ease of exploitation. The vulnerability affects the confidentiality and integrity of affected systems and could disrupt availability if leveraged for further attacks. The recommended remediation is to update the Billey theme to version 2.1.6 or later, which presumably addresses the issue, or to implement input validation and sanitization to prevent malicious file inclusion. Monitoring web server logs for suspicious include attempts and restricting file permissions can also mitigate risk.

For European organizations, this vulnerability could lead to significant data breaches, including exposure of sensitive customer information, intellectual property, or internal credentials stored on compromised servers. Organizations relying on the Billey theme for their WordPress sites, especially those handling personal data under GDPR, face compliance risks and potential financial penalties if exploited. Website defacement or service disruption could damage brand reputation and customer trust. Attackers could leverage the LFI vulnerability to pivot into deeper network compromise, escalating the impact beyond the web server. The risk is heightened for sectors with high online presence such as e-commerce, media, and government services. Given the ease of exploitation without authentication, attackers can rapidly target vulnerable sites, increasing the urgency for mitigation. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as proof-of-concept code could emerge at any time.

1. Immediately update the ThemeMove Billey theme to version 2.1.6 or later once available, as this version addresses the vulnerability. 2. If an update is not immediately possible, apply manual code review and patching to sanitize and validate all inputs controlling include/require statements, ensuring only allowed filenames or paths are accepted. 3. Implement web application firewall (WAF) rules to detect and block suspicious file inclusion attempts, such as requests containing directory traversal sequences or unusual file paths. 4. Restrict file system permissions to limit the web server's access to sensitive files and directories, minimizing the impact of any successful inclusion. 5. Monitor web server and application logs for unusual activity indicative of exploitation attempts, including repeated access to include parameters or error messages related to file inclusion. 6. Conduct regular security audits and vulnerability scans on WordPress installations and themes to identify and remediate similar issues proactively. 7. Educate development and IT teams on secure coding practices related to file inclusion and input validation to prevent recurrence.