CVE-2025-39399 is a vulnerability classified under CWE-98, which pertains to improper control of filenames used in include or require statements within PHP applications. Specifically, this vulnerability affects the 'License For Envato' product developed by Ashraful Sarkar Naiem. The flaw allows for PHP Local File Inclusion (LFI), which means an attacker can manipulate the filename parameter used in include or require statements to include unintended files from the local filesystem. This can lead to unauthorized disclosure of sensitive files, code execution, or other malicious activities depending on the server configuration and the files accessible. The vulnerability arises because the application does not properly validate or sanitize user input controlling the filename, allowing attackers to traverse directories or specify arbitrary file paths. Although the description mentions 'PHP Remote File Inclusion,' the actual impact is local file inclusion, which is generally less severe than remote file inclusion but still significant. No patch or fix has been published yet, and there are no known exploits in the wild as of the publication date (April 24, 2025). The affected versions are not explicitly stated, but the vulnerability affects versions up to 1.0.0. The vulnerability was reserved on April 16, 2025, and is enriched by CISA, indicating recognition by US cybersecurity authorities. The medium severity rating suggests moderate risk, but the absence of a CVSS score requires further assessment. Overall, this vulnerability can be exploited by an attacker who can control input parameters to the vulnerable PHP application, potentially leading to sensitive data exposure or further compromise of the web server environment.

For European organizations using the 'License For Envato' PHP product, this vulnerability poses a risk primarily to web applications that rely on this software for license management or related functionality. Exploitation could lead to unauthorized access to sensitive configuration files, source code, or other critical data stored on the server. This can compromise confidentiality and potentially integrity if attackers use included files to execute arbitrary code or escalate privileges. The availability impact is generally low unless the attacker uses the vulnerability to disrupt service or cause application crashes. Given that the vulnerability requires the attacker to have some level of access to interact with the vulnerable PHP application (likely via HTTP requests), the risk is higher for externally exposed web servers. European organizations in sectors with high reliance on PHP-based web applications, such as e-commerce, digital content distribution, or software licensing, may be particularly affected. The medium severity rating reflects the moderate impact and the fact that exploitation does not require authentication or complex user interaction, increasing the risk. However, the lack of known exploits in the wild suggests that immediate widespread attacks are not yet observed. The impact is also influenced by the deployment scale of the affected product within Europe, which may be limited given the niche nature of the software.

Implement strict input validation and sanitization on all parameters used in include or require statements to ensure only intended files can be included. Use whitelisting of allowed filenames or paths. Apply the principle of least privilege to the web server and PHP process, restricting file system permissions to prevent access to sensitive files outside the application directory. Monitor and audit web server logs for suspicious requests attempting directory traversal or unusual file inclusion patterns. If possible, isolate the vulnerable application in a sandboxed environment or container to limit the blast radius of a potential compromise. Engage with the vendor or developer to obtain patches or updates addressing this vulnerability as soon as they become available. Consider deploying Web Application Firewalls (WAF) with rules designed to detect and block attempts at local file inclusion attacks targeting PHP applications. Educate developers and system administrators about secure coding practices related to file inclusion and PHP application security. Regularly update and patch all components of the web application stack to reduce exposure to known vulnerabilities.