CVE-2026-23975 is a critical vulnerability in the uxper Golo content management system (CMS), identified as an improper control of filename for include/require statements in PHP programs. This vulnerability allows remote file inclusion (RFI), where an attacker can manipulate the filename parameter used in PHP's include or require functions to load malicious remote code. The flaw exists in Golo versions prior to 1.7.5 and does not require authentication, user interaction, or elevated privileges to exploit. Exploitation can lead to full remote code execution on the affected server, compromising confidentiality, integrity, and availability of the system. The vulnerability has a CVSS 3.1 base score of 9.8, reflecting its critical nature with network attack vector, low attack complexity, no privileges required, and no user interaction needed. Although no public exploits have been reported yet, the vulnerability's characteristics make it a prime target for attackers seeking to compromise web servers running Golo CMS. The root cause is insufficient validation or sanitization of input controlling the filename in PHP include/require statements, allowing attackers to specify remote URLs or local files to be included and executed by the PHP interpreter. This can lead to arbitrary code execution, data theft, or complete system takeover.

For European organizations, the impact of CVE-2026-23975 is significant, especially for those relying on the Golo CMS or similar PHP-based web applications. Successful exploitation can result in full system compromise, data breaches involving sensitive customer or business information, defacement of websites, disruption of services, and potential lateral movement within internal networks. Public-facing web servers are particularly vulnerable, increasing the risk of widespread attacks. The critical severity and ease of exploitation mean attackers can quickly leverage this vulnerability to deploy malware, ransomware, or use compromised servers as part of botnets. This can lead to reputational damage, regulatory penalties under GDPR for data breaches, and operational downtime. The lack of known exploits currently provides a window for proactive mitigation, but the threat landscape suggests rapid weaponization is likely once details become widely known.

1. Immediately upgrade all affected Golo CMS instances to version 1.7.5 or later, where the vulnerability is patched. 2. If patching is not immediately possible, apply virtual patching via web application firewalls (WAFs) configured to block suspicious include/require parameters or remote URL requests. 3. Implement strict input validation and sanitization on all user-controllable parameters that influence file inclusion or require statements in PHP code. 4. Disable allow_url_include and allow_url_fopen directives in PHP configurations to prevent remote file inclusion. 5. Conduct thorough code reviews and security testing of custom PHP code to identify and remediate similar insecure coding patterns. 6. Monitor web server logs for anomalous requests attempting to exploit file inclusion vectors. 7. Employ network segmentation and least privilege principles to limit the impact of potential compromises. 8. Maintain regular backups and incident response plans to quickly recover from any successful attacks.