CVE-2025-63678 identifies a vulnerability in CMS Made Simple Foundation File Manager version 2.2.22, specifically in the /uploads/ endpoint. This vulnerability allows authenticated users with Administrator privileges to upload arbitrary files, including crafted PHP scripts, which can lead to remote code execution on the affected server. The root cause is an insufficient validation or sanitization of uploaded files, categorized under CWE-434 (Unrestricted Upload of File with Dangerous Type). The vulnerability requires the attacker to have administrative access, which limits the attack surface but does not eliminate risk, especially in environments where administrator credentials may be compromised or shared. The CVSS v3.1 base score is 3.8 (low), reflecting the need for privileges and the limited impact on confidentiality, integrity, and availability. The attack vector is network-based with low attack complexity and no user interaction needed. While no public exploits have been reported, the ability to execute arbitrary code poses a significant risk if exploited. This vulnerability underscores the importance of secure file upload handling and strict access controls within CMS platforms. Currently, no official patches are listed, so organizations must rely on compensating controls until a fix is released.

For European organizations, the impact of this vulnerability is primarily on web servers running CMS Made Simple Foundation File Manager v2.2.22. If exploited, attackers with administrator credentials could execute arbitrary code, potentially leading to server compromise, data leakage, or pivoting within the network. Although the CVSS score is low, the risk increases in environments where administrator credentials are weak, reused, or exposed. Public-facing CMS installations are particularly at risk, as compromise could lead to defacement, malware distribution, or further exploitation of internal systems. The limited availability of patches means organizations must be vigilant in monitoring and access control. The impact on confidentiality is limited but not negligible, as code execution could facilitate data exfiltration. Integrity and availability impacts are also low but could escalate depending on attacker actions post-exploitation. Overall, the threat is moderate for European organizations with this CMS in use, especially those with less mature access management and monitoring practices.

1. Restrict administrator access strictly to trusted personnel and enforce strong, unique credentials with multi-factor authentication (MFA). 2. Monitor and audit administrator activities and file upload endpoints for unusual or unauthorized uploads. 3. Implement file upload validation and filtering at the web server or application firewall level to block executable file types such as PHP. 4. Isolate the upload directory with strict permissions and disable execution rights on uploaded files to prevent code execution. 5. Regularly review and update CMS and plugin versions; apply patches promptly once available. 6. Employ network segmentation to limit the impact of a compromised CMS server. 7. Conduct regular security assessments and penetration tests focusing on file upload functionalities. 8. Educate administrators on the risks of file uploads and secure handling practices. 9. Consider deploying runtime application self-protection (RASP) or web application firewalls (WAF) with rules targeting suspicious upload behavior. 10. Maintain comprehensive backups to enable recovery in case of compromise.