CVE-2025-10741 is a security vulnerability identified in Selleo Mentingo, a software product used for social or profile management functionalities, specifically affecting versions up to 2025.08.27. The vulnerability resides in the Profile Picture Handler component, where the userAvatar argument can be manipulated to perform an unrestricted file upload. This flaw allows an unauthenticated remote attacker to upload arbitrary files to the server without proper validation or restrictions. The vulnerability does not require user interaction or prior authentication, making it remotely exploitable over the network. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the moderate impact on confidentiality, integrity, and availability, with low complexity and no privileges required. The vendor was notified early but has not responded or issued a patch, and the exploit details have been publicly disclosed, increasing the risk of exploitation. Unrestricted upload vulnerabilities can lead to remote code execution, web shell deployment, data compromise, or service disruption if the attacker uploads malicious scripts or executables. Since the vulnerability affects a profile picture upload function, it is likely part of a web application interface, which is commonly exposed to the internet, increasing exposure. The lack of vendor response and public exploit disclosure heightens the urgency for affected users to implement mitigations or consider alternative protective measures until a patch is available.

For European organizations using Selleo Mentingo, this vulnerability poses a significant risk of unauthorized access and potential system compromise. Exploitation could lead to remote code execution, allowing attackers to execute arbitrary commands, steal sensitive user data, or disrupt services. Given the nature of the vulnerability, it could be leveraged to implant persistent backdoors or web shells, facilitating long-term unauthorized access. Organizations handling personal data, especially under GDPR regulations, face compliance risks and potential fines if data breaches occur due to this vulnerability. The medium CVSS score indicates a moderate but tangible threat, especially in environments where the affected software is internet-facing or integrated with critical business processes. The absence of a vendor patch and public exploit availability increases the likelihood of attacks targeting European entities. Additionally, the vulnerability could be exploited as a foothold in multi-stage attacks, impacting confidentiality, integrity, and availability of systems and data.

1. Immediate mitigation should include disabling or restricting the profile picture upload functionality until a patch is available. 2. Implement strict input validation and file type restrictions at the web server or application firewall level to block unauthorized file types and suspicious payloads. 3. Use web application firewalls (WAFs) with custom rules to detect and block attempts to exploit the userAvatar upload parameter. 4. Monitor server logs for unusual file upload activities or unexpected file types in upload directories. 5. Isolate the upload directory with minimal permissions and prevent execution of uploaded files by configuring the web server to disallow script execution in upload folders. 6. Employ network segmentation to limit access to the affected application and reduce lateral movement in case of compromise. 7. Conduct regular security audits and vulnerability scans to detect exploitation attempts. 8. Engage with Selleo for updates and patches, and apply them promptly once available. 9. Consider deploying endpoint detection and response (EDR) solutions to detect anomalous behaviors indicative of exploitation.