CVE-2025-10741 is a medium-severity security vulnerability affecting Selleo Mentingo versions up to 2025.08.27. The vulnerability resides in the Profile Picture Handler component, specifically in an unknown function that processes the userAvatar argument. This flaw allows an attacker to perform an unrestricted file upload remotely without requiring user interaction or elevated privileges beyond low-level privileges. The unrestricted upload means that malicious files, including web shells or malware, can be uploaded to the server hosting Mentingo, potentially enabling remote code execution, data compromise, or further system compromise. The vulnerability has a CVSS 4.0 base score of 5.3, reflecting its medium severity, with an attack vector of network (remote), low attack complexity, no privileges required beyond low-level, and no user interaction needed. The impact on confidentiality, integrity, and availability is low to limited individually but combined could lead to significant compromise if exploited. The vendor has been contacted but has not responded or issued a patch, and no known exploits are currently observed in the wild, though public exploit details exist. This vulnerability is critical to address promptly due to the potential for attackers to leverage the unrestricted upload to gain persistent access or disrupt services.

For European organizations using Selleo Mentingo, this vulnerability poses a tangible risk of unauthorized access and potential system compromise. Exploitation could lead to unauthorized data access, defacement, or service disruption, impacting business operations and potentially violating GDPR requirements for data protection. Organizations in sectors with sensitive user data or critical services, such as healthcare, finance, or government, could face reputational damage and regulatory penalties if exploited. The lack of vendor response and patch availability increases the window of exposure. Additionally, the ability to upload arbitrary files remotely without authentication or user interaction lowers the barrier for attackers, increasing the likelihood of exploitation attempts. The impact is heightened in environments where Mentingo is integrated with other critical systems or where uploaded files can be executed or interpreted by the server.

European organizations should implement immediate compensating controls to mitigate this vulnerability. These include: 1) Restricting file upload directories with strict permissions and disabling execution rights to prevent uploaded files from being executed. 2) Implementing network-level controls such as web application firewalls (WAFs) with rules to detect and block suspicious upload patterns or file types. 3) Monitoring logs for unusual upload activity or file types and setting up alerts for anomalous behavior. 4) Isolating the Mentingo application environment to limit lateral movement if compromise occurs. 5) Applying strict input validation and sanitization on the userAvatar parameter if possible via configuration or custom patches. 6) Engaging with Selleo for updates and tracking any future patches or advisories. 7) Considering temporary disabling or restricting the profile picture upload functionality until a patch is available. 8) Conducting regular vulnerability scans and penetration tests focusing on file upload mechanisms. These steps go beyond generic advice by focusing on practical containment and detection strategies tailored to the unrestricted upload vector.