CVE-2025-58803 is a vulnerability classified as Improper Control of Filename for Include/Require Statement in PHP programs, specifically affecting the axiomthemes Algenix theme for PHP-based websites. The vulnerability allows Remote File Inclusion (RFI), where an attacker can manipulate the filename parameter used in PHP include or require statements to load and execute arbitrary remote files. This occurs due to insufficient validation or sanitization of user-supplied input controlling the file path. The affected product is Algenix theme versions up to 1.0, with no patch currently available or linked. Exploiting this vulnerability enables attackers to execute arbitrary PHP code on the server, potentially leading to full system compromise, data theft, defacement, or pivoting within the network. The vulnerability does not require authentication, increasing its risk profile. Although no known exploits are reported in the wild, the nature of RFI vulnerabilities historically makes them attractive targets for attackers. The vulnerability was reserved in September 2025 and published in December 2025, indicating recent discovery. The lack of a CVSS score necessitates a severity assessment based on impact and exploitability factors. The vulnerability affects the confidentiality, integrity, and availability of affected systems, as arbitrary code execution can lead to data breaches and service disruption. The scope includes all websites running the vulnerable Algenix theme, which is a niche but potentially widely used PHP theme in WordPress or similar CMS environments. The vulnerability requires no user interaction, making automated exploitation feasible. Given these factors, the vulnerability is critical for affected systems but is assessed as high severity overall due to the limited scope of the affected product. The absence of patches means organizations must rely on temporary mitigations until updates are released.

For European organizations, the impact of CVE-2025-58803 can be significant, especially for those relying on the Algenix theme in their web infrastructure. Successful exploitation could lead to remote code execution, allowing attackers to take full control of web servers, access sensitive data, modify website content, or use compromised servers as a foothold for further attacks within corporate networks. This could result in data breaches involving personal data protected under GDPR, leading to regulatory penalties and reputational damage. Additionally, service disruptions caused by defacement or server compromise could impact business continuity and customer trust. Organizations in sectors such as e-commerce, government, and media, which often rely on PHP-based CMS platforms, are particularly at risk. The lack of known exploits currently reduces immediate risk but also means organizations must be proactive in mitigation. The vulnerability's ability to be exploited without authentication and user interaction increases the likelihood of automated attacks, which could rapidly affect multiple organizations across Europe if weaponized. Overall, the threat poses a high risk to confidentiality, integrity, and availability of affected web assets in European organizations.

1. Monitor official axiomthemes channels and Patchstack for any released patches or updates addressing CVE-2025-58803 and apply them immediately upon availability. 2. Until patches are available, implement strict input validation and sanitization on all parameters controlling file inclusion paths to prevent injection of remote URLs or unauthorized file paths. 3. Disable allow_url_include and allow_url_fopen directives in the PHP configuration to prevent remote file inclusion. 4. Employ Web Application Firewalls (WAFs) with rules designed to detect and block suspicious include/require parameter manipulations. 5. Conduct thorough code reviews of customizations or plugins that interact with the Algenix theme to identify and remediate unsafe file inclusion practices. 6. Restrict file permissions on web servers to limit the impact of potential code execution. 7. Implement network segmentation to isolate web servers from critical internal systems to reduce lateral movement risk. 8. Regularly audit logs for unusual requests targeting file inclusion parameters and respond promptly to suspicious activity. 9. Educate development and security teams about secure coding practices related to file inclusion vulnerabilities. 10. Consider temporary removal or replacement of the Algenix theme if immediate patching is not feasible and risk is unacceptable.