CVE-2026-0566 is a security vulnerability identified in version 1.0 of the code-projects Content Management System (CMS). The flaw resides in the /admin/edit_posts.php file, specifically in the handling of the 'image' parameter, which allows an attacker to perform unrestricted file uploads. This means that an attacker with authenticated access at a high privilege level can upload arbitrary files, including potentially malicious scripts, without proper validation or restriction. The vulnerability is exploitable remotely and does not require user interaction, but it does require the attacker to have high-level privileges within the CMS, such as an administrator account. The unrestricted upload can lead to serious consequences, including remote code execution, website defacement, data theft, or pivoting within the network. The vulnerability has been publicly disclosed, increasing the likelihood that attackers may develop exploits, although no known exploits are currently reported in the wild. The CVSS 4.0 base score is 5.1, indicating a medium severity, primarily because exploitation requires authenticated high privileges and the impact on confidentiality, integrity, and availability is limited to the CMS environment. No official patches or updates have been linked yet, so organizations must rely on mitigating controls until a fix is available.

For European organizations using code-projects CMS version 1.0, this vulnerability poses a significant risk, particularly for those with publicly accessible administrative interfaces. Successful exploitation could allow attackers to upload malicious files, potentially leading to remote code execution, unauthorized access to sensitive data, or disruption of web services. This could result in reputational damage, regulatory penalties under GDPR if personal data is compromised, and operational downtime. Sectors such as government, education, and small to medium enterprises that rely on this CMS for content management are particularly vulnerable. The requirement for high privilege authentication limits the risk somewhat but insider threats or compromised credentials could facilitate exploitation. The lack of a patch increases exposure time, and public disclosure raises the risk of opportunistic attacks. Overall, the vulnerability could be leveraged as a foothold for broader network compromise or data exfiltration within European organizations.

Organizations should immediately audit their use of code-projects CMS version 1.0 and restrict administrative access to trusted personnel only. Implement strong authentication mechanisms, including multi-factor authentication, to reduce the risk of credential compromise. Until an official patch is released, apply strict input validation and file type restrictions on uploads, ideally limiting uploads to safe file types and scanning uploaded files for malware. Employ web application firewalls (WAFs) to detect and block suspicious upload attempts targeting the /admin/edit_posts.php endpoint. Regularly monitor logs for unusual activity related to file uploads or administrative actions. Segregate the CMS environment from critical internal networks to limit lateral movement if compromise occurs. Finally, maintain up-to-date backups and develop an incident response plan specific to web application compromises.