CVE-2025-52758 is a critical security vulnerability found in the Zippy product developed by Gesundheit Bewegt GmbH, affecting all versions up to and including 1.7.0. The vulnerability is characterized by an unrestricted upload of files with dangerous types, meaning the application does not properly validate or restrict the types of files users can upload. This flaw allows an unauthenticated attacker to upload malicious files, such as web shells or scripts, which can then be executed on the server or used to compromise the system's confidentiality and integrity. The vulnerability has a CVSS 3.1 base score of 9.1, indicating a critical severity level, with attack vector being network-based (AV:N), no privileges required (PR:N), no user interaction needed (UI:N), and a scope that remains unchanged (S:U). The impact on confidentiality and integrity is high (C:H/I:H), while availability is not affected (A:N). Although no public exploits are known at this time, the nature of the vulnerability makes it highly exploitable, especially in environments where Zippy is exposed to the internet or untrusted users. The lack of patch links suggests that a fix may not yet be publicly available, increasing the urgency for organizations to implement interim mitigations. This vulnerability could be leveraged to deploy malware, conduct data exfiltration, or pivot within a network, posing a significant threat to affected organizations.

For European organizations, the impact of CVE-2025-52758 can be severe. Organizations using Zippy for file sharing, collaboration, or content management may face unauthorized disclosure of sensitive data if attackers upload and execute malicious files. The integrity of data and systems can be compromised, leading to potential data manipulation or destruction. The vulnerability could also be used as a foothold for further attacks within corporate networks, including lateral movement and deployment of ransomware or other malware. Critical sectors such as healthcare, finance, and government agencies that rely on Zippy for internal or external file handling are particularly at risk. The disruption caused by a successful exploit could result in operational downtime, regulatory penalties under GDPR for data breaches, and reputational damage. Since the vulnerability requires no authentication or user interaction, the attack surface is broad, increasing the likelihood of exploitation if the product is internet-facing or accessible by untrusted users.

Until an official patch is released, European organizations should implement strict file upload validation controls at the application and network levels. This includes restricting allowed file types to a safe whitelist, scanning uploaded files for malware, and enforcing size and content restrictions. Deploying web application firewalls (WAFs) with rules to detect and block suspicious upload attempts can reduce risk. Network segmentation should be used to isolate systems running Zippy from critical infrastructure. Monitoring and logging file upload activities can help detect anomalous behavior early. Organizations should also review user permissions to limit upload capabilities to trusted users only. Once a patch is available, immediate application is critical. Additionally, conducting security awareness training to inform administrators about this vulnerability and encouraging regular security assessments of the Zippy deployment environment will strengthen defenses.