CVE-2025-4305 is a medium-severity vulnerability affecting the 'kefaming mayi' software versions 1.3.0 through 1.3.9. The vulnerability resides in the Upload function located in the file app/tools/controller/File.php. Specifically, the issue arises from improper validation or sanitization of the 'File' argument, which allows an attacker to perform unrestricted file uploads remotely without requiring user interaction or elevated privileges. This means an attacker can upload arbitrary files, potentially including malicious scripts or executables, to the server running the vulnerable application. The vulnerability has a CVSS 4.0 base score of 5.3, reflecting a network attack vector with low complexity, no privileges or user interaction required, but limited impact on confidentiality, integrity, and availability. Although no known exploits are currently observed in the wild, the exploit details have been publicly disclosed, increasing the risk of exploitation. The unrestricted upload flaw could lead to remote code execution, data compromise, or service disruption if the uploaded files are executed or accessed improperly. The vulnerability does not require authentication, making it accessible to unauthenticated attackers, and the scope is limited to systems running the affected versions of kefaming mayi. No official patches or mitigation links are provided yet, indicating that organizations must implement interim controls to reduce risk.

For European organizations using kefaming mayi versions 1.3.0 to 1.3.9, this vulnerability poses a significant risk of unauthorized access and potential system compromise. The ability to upload arbitrary files remotely can lead to remote code execution, data leakage, or defacement of web resources. This can impact confidentiality by exposing sensitive data, integrity by allowing unauthorized modification or insertion of malicious content, and availability if attackers disrupt services. Organizations in sectors with high regulatory requirements such as finance, healthcare, and government could face compliance violations and reputational damage if exploited. The medium CVSS score suggests the impact is moderate but should not be underestimated given the lack of authentication and ease of exploitation. Since the vulnerability is in a web-facing upload function, it is particularly relevant for organizations with public-facing applications or portals using this software. The absence of known exploits in the wild currently reduces immediate risk but the public disclosure increases the likelihood of future attacks, especially by opportunistic threat actors targeting European entities with lax patching practices.

1. Immediate mitigation should include disabling or restricting the upload functionality in the affected application until a patch is available. 2. Implement strict server-side validation and sanitization of uploaded files, including checking file types, sizes, and content signatures. 3. Use web application firewalls (WAFs) to detect and block suspicious upload attempts targeting the vulnerable endpoint. 4. Restrict file upload directories with appropriate permissions to prevent execution of uploaded files, e.g., configuring the web server to disallow execution in upload folders. 5. Monitor logs for unusual upload activity and conduct regular security audits of the application. 6. If possible, isolate the application environment to limit lateral movement in case of compromise. 7. Stay alert for official patches or updates from the vendor and apply them promptly once released. 8. Educate development and operations teams about secure file upload handling to prevent similar issues in the future.