CVE-2025-56295 describes a file upload vulnerability in code-projects Computer Laboratory System 1.0. The flaw allows authenticated staff users to upload PHP backdoor files while changing their personal avatar, which can be leveraged to deploy web shells and escalate privileges on the server. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and has a CVSS 3.1 base score of 7.3 with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts confidentiality and integrity with high severity.

Successful exploitation allows an authenticated staff user to upload malicious PHP files that act as backdoors, enabling remote code execution via web shells. This leads to unauthorized access and control over the server, compromising confidentiality and integrity of the system. Availability impact is not indicated.

No official patch or remediation is currently available for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is provided, restrict file upload permissions, validate and sanitize uploaded files to disallow executable types, and monitor for suspicious file uploads as interim mitigations.