CVE-2025-58955 is a vulnerability classified as Improper Control of Filename for Include/Require Statement in the PHP program Karzo developed by designervily. This vulnerability is a Remote File Inclusion (RFI) flaw, which occurs when the application fails to properly validate or sanitize user-supplied input used in PHP include or require statements. As a result, an attacker can supply a crafted filename or URL that causes the application to include and execute remote malicious PHP code. The affected product is Karzo, versions prior to 2.6. The vulnerability allows remote attackers to execute arbitrary code on the server without requiring authentication or user interaction, although the attack complexity is high, meaning some conditions must be met for successful exploitation. The CVSS v3.1 base score is 8.1, indicating a high severity with network attack vector, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. This vulnerability can lead to full system compromise, data theft, defacement, or denial of service. No public exploits have been reported yet, but the vulnerability is published and known to security communities. The root cause is insufficient input validation in the PHP include/require logic within Karzo, which is a common issue in PHP applications that dynamically include files based on user input. The vulnerability was reserved in early September 2025 and published in October 2025. No official patches or mitigation links are currently available, so users must rely on temporary mitigations and monitoring until a patch is released.

For European organizations, this vulnerability poses a significant risk, especially for those relying on Karzo for web applications or e-commerce platforms. Successful exploitation can lead to remote code execution, allowing attackers to gain unauthorized access to sensitive data, manipulate or destroy data, disrupt services, or use compromised servers as pivot points for further attacks. This can result in data breaches, financial losses, reputational damage, and regulatory penalties under GDPR. The high severity and remote exploitation capability make it a critical concern for organizations with internet-facing PHP applications. Additionally, the lack of authentication requirement means that attackers can target vulnerable systems directly from the internet. The potential impact extends to critical infrastructure, government websites, and private enterprises using Karzo, increasing the risk of widespread disruption. European entities with limited patch management capabilities or legacy systems may face prolonged exposure. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers often develop exploits rapidly after disclosure.

1. Immediate code audit: Review all PHP include/require statements in Karzo installations to identify and sanitize user inputs rigorously. 2. Input validation: Implement strict whitelisting of allowed filenames or paths to prevent arbitrary file inclusion. 3. Disable remote file inclusion: Configure PHP settings (e.g., disable allow_url_include) to prevent inclusion of remote files. 4. Network controls: Use web application firewalls (WAFs) to detect and block suspicious requests targeting file inclusion vectors. 5. Monitor logs: Enable detailed logging and monitor for unusual access patterns or errors related to file inclusion. 6. Segmentation: Isolate vulnerable systems from critical networks to limit potential lateral movement. 7. Patch management: Stay alert for official patches or updates from designervily and apply them promptly once available. 8. Incident response readiness: Prepare to respond quickly to any signs of exploitation, including forensic analysis and containment. 9. Backup: Maintain secure, regular backups of affected systems to enable recovery in case of compromise. 10. Educate developers and administrators about secure coding practices related to file inclusion.