CVE-2025-8074 is a vulnerability identified in Synology BeeDrive for desktop, specifically in versions prior to 1.4.3-13973. The root cause is an origin validation error, which means the software fails to properly verify the source of certain requests or actions. This flaw allows local users with limited privileges (PR:L) to write arbitrary files on the system. The files written contain non-sensitive information, indicating that confidentiality is not directly compromised. However, the ability to write arbitrary files can affect the integrity of the system and potentially disrupt availability if critical files are overwritten or manipulated. The attack requires user interaction (UI:R), such as opening a malicious file or triggering a specific action, and cannot be exploited remotely (AV:L). The vulnerability scope is unchanged (S:U), meaning the impact is limited to the local system context. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H, resulting in a medium severity score of 5.6. No known exploits have been reported in the wild, and Synology has not yet published a patch or detailed mitigation guidance. The vulnerability likely arises from improper origin checks in the desktop client’s handling of file operations or synchronization processes, allowing local attackers to bypass restrictions and write files arbitrarily.

For European organizations, the impact of CVE-2025-8074 is primarily on system integrity and availability rather than confidentiality. Local attackers with limited privileges could exploit this vulnerability to write arbitrary files, potentially leading to system instability, denial of service, or manipulation of application behavior. Although the vulnerability does not allow remote exploitation, insider threats or compromised local accounts could leverage this flaw. Organizations relying on Synology BeeDrive for desktop to synchronize or manage files may experience disruptions or data integrity issues. The impact is more pronounced in environments where multiple users share workstations or where endpoint security is lax. Given the medium severity and local scope, the overall risk is moderate but should not be ignored, especially in sectors with strict data integrity requirements such as finance, healthcare, and critical infrastructure.

Organizations should immediately update Synology BeeDrive for desktop to version 1.4.3-13973 or later once available. Until a patch is released, restrict local user permissions to minimize the risk of exploitation, ensuring that only trusted users have access to systems running BeeDrive. Implement strict endpoint security controls, including application whitelisting and monitoring for unusual file write activities. Educate users about the risks of interacting with untrusted files or links that could trigger the vulnerability. Employ host-based intrusion detection systems (HIDS) to detect anomalous file operations. Regularly audit local user privileges and remove unnecessary accounts. Additionally, isolate critical systems and enforce network segmentation to limit the lateral movement of potential attackers exploiting local vulnerabilities. Finally, maintain up-to-date backups to recover from any integrity or availability issues caused by exploitation.