CVE-2025-54790 is a critical SQL Injection vulnerability (CWE-89) found in the 'Files' module of the HumHub social collaboration platform, specifically in the 'cfiles' component versions prior to 0.16.10. The 'Files' module is responsible for managing files within user profiles and spaces. The vulnerability arises due to improper neutralization of special elements in SQL commands, allowing an attacker to manipulate backend SQL queries. Notably, the flaw does not produce direct output but can be exploited to access unauthorized data from the database. Since the vulnerability requires no authentication, no user interaction, and can be exploited remotely over the network, it poses a significant risk. The CVSS 4.0 base score of 9.2 reflects its critical severity, with attack vector as network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality (VC:H), while integrity and availability remain unaffected. The vulnerability was published on August 1, 2025, and fixed in version 0.16.10 of the cfiles module. No known exploits have been reported in the wild yet, but the critical nature and ease of exploitation make it a high-priority patch for affected users. The lack of direct output from the SQL injection suggests a blind SQL injection scenario, which can still be leveraged to extract sensitive data through time-based or boolean-based techniques.

For European organizations using HumHub with the vulnerable cfiles module, this vulnerability could lead to unauthorized access to sensitive data stored within the platform's databases, including potentially confidential user information, internal documents, or business-critical files. Since HumHub is often used for internal collaboration, the compromise of such data can result in significant confidentiality breaches, loss of trust, and compliance violations under regulations such as GDPR. The vulnerability's network accessibility and no requirement for authentication increase the risk of widespread exploitation, especially in organizations with publicly accessible HumHub instances. This could lead to data leakage, intellectual property theft, or further lateral movement within the network if attackers leverage the information obtained. The impact is particularly severe for sectors with high data sensitivity such as finance, healthcare, government, and critical infrastructure within Europe.

1. Immediate upgrade of the HumHub cfiles module to version 0.16.10 or later to apply the official patch that fixes the SQL injection vulnerability. 2. Conduct a thorough audit of all HumHub instances across the organization to identify any running vulnerable versions. 3. Implement Web Application Firewall (WAF) rules specifically designed to detect and block SQL injection attempts targeting HumHub endpoints, focusing on the 'Files' module. 4. Restrict external access to HumHub instances where possible, limiting exposure to trusted networks or VPNs. 5. Monitor application logs and database query logs for unusual or suspicious activity indicative of SQL injection attempts or data exfiltration. 6. Perform regular security assessments and penetration testing on HumHub deployments to detect any residual or related vulnerabilities. 7. Educate administrators about the importance of timely patching and maintaining secure configurations for collaboration platforms.