CVE-2025-67528 is a vulnerability classified as Improper Control of Filename for Include/Require Statement in the thembay Urna PHP program, specifically a Remote File Inclusion (RFI) flaw. This vulnerability exists because the application fails to properly validate or sanitize user-supplied input used in PHP include or require statements. As a result, an attacker can manipulate the filename parameter to include a remote file hosted on an attacker-controlled server. When the vulnerable PHP script executes, it fetches and runs the malicious remote code, leading to remote code execution (RCE). This can allow attackers to execute arbitrary commands, escalate privileges, steal sensitive data, or pivot within the network. The vulnerability affects all versions of Urna up to and including 2.5.12. Although no public exploits have been reported yet, the nature of RFI vulnerabilities makes them highly exploitable, especially on servers with default PHP configurations that allow remote file inclusion. The vulnerability was published on December 9, 2025, and currently lacks an official CVSS score or patch. The absence of patches and the critical nature of RFI vulnerabilities necessitate immediate attention from users of the thembay Urna product. The vulnerability is particularly dangerous because it does not require authentication or user interaction, and can be exploited remotely over the internet. This flaw is a common vector for web application compromise, often leading to full server takeover or deployment of web shells.

For European organizations, this vulnerability poses a significant risk to web servers running the thembay Urna PHP application. Successful exploitation can lead to complete system compromise, allowing attackers to execute arbitrary code, access sensitive customer or business data, deface websites, or use the compromised server as a foothold for further attacks within the corporate network. This can result in data breaches, service outages, reputational damage, and regulatory penalties under GDPR. Organizations relying on Urna for content management or e-commerce may experience operational disruptions and financial losses. The vulnerability's remote exploitation capability means attackers can target organizations without prior access, increasing the attack surface. Additionally, the lack of known exploits in the wild currently provides a window for proactive mitigation, but the risk of future exploitation remains high. The impact is exacerbated in environments where PHP configurations allow remote file inclusion or where security monitoring is insufficient.

European organizations using thembay Urna should immediately audit their installations to identify affected versions (<= 2.5.12). Until an official patch is released, implement the following mitigations: 1) Disable allow_url_include and allow_url_fopen in PHP configurations to prevent remote file inclusion. 2) Apply strict input validation and sanitization on all parameters used in include or require statements, ensuring only local, trusted files can be included. 3) Employ web application firewalls (WAFs) with rules to detect and block suspicious requests attempting to include remote URLs. 4) Monitor web server and application logs for unusual include patterns or external URL references. 5) Restrict file system permissions to limit the impact of potential code execution. 6) Plan for timely application of official patches once available from thembay. 7) Conduct security awareness training for developers and administrators on secure coding practices related to file inclusion. These steps go beyond generic advice by focusing on configuration hardening, proactive detection, and immediate risk reduction.