CVE-2026-2226 is a vulnerability identified in DouPHP, a PHP-based content management system, affecting all versions up to 1.9. The flaw exists in the /admin/file.php script, specifically within the ZIP File Handler component that processes the sql_filename parameter. Due to insufficient validation or sanitization of this parameter, an attacker with high privileges can perform an unrestricted file upload remotely. This means malicious files, including web shells or malware, can be uploaded to the server, potentially leading to remote code execution or further compromise. The vulnerability does not require user interaction but does require the attacker to have high privileges, indicating that initial access or credential compromise is a prerequisite. The CVSS 4.0 score of 5.1 reflects a medium severity, considering the network attack vector, low complexity, no user interaction, but requiring privileges. No patches or fixes have been officially released yet, and no known exploits are currently active in the wild, but public disclosure increases the risk of exploitation. The vulnerability impacts the confidentiality, integrity, and availability of affected systems by enabling unauthorized file uploads that can be leveraged for persistent access or data theft. DouPHP is commonly used in small to medium-sized enterprises for e-commerce and content management, making this vulnerability relevant for organizations relying on this platform.

For European organizations, exploitation of CVE-2026-2226 could result in unauthorized file uploads leading to remote code execution, data breaches, defacement of websites, or service outages. This is particularly critical for businesses using DouPHP for online storefronts or content delivery, as attackers could deploy web shells or malware to pivot within networks or exfiltrate sensitive customer data. The requirement for high privileges means that attackers must first compromise credentials or escalate privileges, but once achieved, the impact can be severe. The vulnerability could also facilitate supply chain attacks if DouPHP instances are integrated into larger IT ecosystems. Given the public disclosure and lack of patches, European organizations face increased risk, especially those with limited security monitoring or outdated software management practices. The medium severity rating suggests a moderate but non-negligible risk that should be addressed promptly to prevent exploitation.

1. Restrict access to the /admin/file.php endpoint by IP whitelisting or VPN-only access to limit exposure. 2. Implement strict input validation and sanitization on the sql_filename parameter to prevent malicious file uploads. 3. Monitor web server logs and file upload directories for unusual or unauthorized files indicative of exploitation attempts. 4. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious upload requests targeting the vulnerable component. 5. Enforce strong authentication and privilege management to reduce the risk of attackers obtaining high-level access required to exploit this vulnerability. 6. Regularly audit and update DouPHP installations and related components once official patches or updates become available. 7. Conduct internal penetration testing focused on file upload functionalities to identify and remediate similar weaknesses. 8. Educate administrators on the risks of this vulnerability and the importance of monitoring and incident response readiness.