CVE-2025-59558 is a vulnerability identified in the ThemeMove Billey WordPress theme, affecting versions prior to 2.1.6. The issue stems from improper control over the filename parameter used in PHP include or require statements, which leads to a Local File Inclusion (LFI) vulnerability. LFI vulnerabilities allow attackers to trick the application into including files from the local filesystem, potentially disclosing sensitive information or executing arbitrary code if combined with other vulnerabilities or misconfigurations. This vulnerability does not require authentication or user interaction, making it remotely exploitable over the network. The CVSS v3.1 score of 8.1 reflects the high impact on confidentiality, integrity, and availability, with a network attack vector but high attack complexity. The vulnerability could allow attackers to read sensitive files such as configuration files, password stores, or even escalate to remote code execution by including malicious files. Although no public exploits are currently known, the nature of LFI vulnerabilities and the popularity of WordPress themes make this a critical issue to address. The vulnerability was reserved in September 2025 and published in October 2025, indicating recent discovery and disclosure. The lack of available patches at the time of reporting necessitates urgent attention from users of the affected theme.

For European organizations, the impact of CVE-2025-59558 can be severe. Many European businesses rely on WordPress for their websites, and themes like Billey are commonly used for their flexibility and design. Exploitation of this vulnerability could lead to unauthorized disclosure of sensitive data, including customer information, internal documents, or authentication credentials stored on the server. Furthermore, attackers could achieve remote code execution, leading to full server compromise, defacement, or use of the server as a pivot point for further attacks within the network. This could disrupt business operations, damage reputation, and lead to regulatory non-compliance under GDPR due to data breaches. The vulnerability’s remote exploitability without authentication increases the risk of automated scanning and exploitation attempts, especially targeting European organizations with high web presence. The high attack complexity somewhat limits mass exploitation but does not eliminate targeted attacks against high-value targets.

European organizations using the ThemeMove Billey theme should immediately verify their theme version and upgrade to version 2.1.6 or later once available. Until a patch is applied, organizations should implement strict input validation to prevent malicious filename parameters from being processed. Employing a Web Application Firewall (WAF) with rules to detect and block LFI attack patterns can reduce exposure. Conduct thorough code reviews to identify and remediate unsafe include/require statements in custom or third-party code. Restrict file permissions on the server to limit access to sensitive files and directories. Monitor web server logs for suspicious requests that may indicate exploitation attempts. Additionally, organizations should isolate critical web servers from internal networks and ensure regular backups are maintained to enable recovery in case of compromise. Finally, maintain awareness of updates from ThemeMove and security advisories to apply patches promptly.