CVE-2025-46388 is a medium-severity vulnerability identified in Emby MediaBrowser version 4.9.0.35. It is classified under CWE-200, which pertains to the exposure of sensitive information to unauthorized actors. This vulnerability allows an attacker with network access and low privileges (PR:L) to gain access to sensitive information without requiring user interaction (UI:N). The attack vector is network-based (AV:N), meaning the attacker can exploit this vulnerability remotely. The vulnerability does not affect the integrity or availability of the system but compromises confidentiality by leaking sensitive data. The CVSS v3.1 base score is 4.3, reflecting a moderate risk primarily due to the limited scope of impact and the requirement for some level of privilege. No known exploits are currently in the wild, and no patches have been published yet. The vulnerability affects a specific version of Emby MediaBrowser, a media server software used for organizing and streaming personal media collections. The exposure of sensitive information could include user data, configuration details, or media metadata, which could be leveraged for further attacks or privacy violations.

For European organizations using Emby MediaBrowser 4.9.0.35, this vulnerability poses a risk of unauthorized disclosure of sensitive information. This could lead to privacy breaches, especially if personal or corporate media content metadata is exposed. Organizations in sectors with strict data protection regulations, such as GDPR, may face compliance issues and potential fines if sensitive user data is leaked. Additionally, exposure of configuration or authentication details could facilitate lateral movement or escalation by attackers within the network. Although the vulnerability does not directly impact system integrity or availability, the confidentiality breach could undermine trust in the organization's data handling practices and lead to reputational damage. Media servers are often deployed in home offices, small businesses, and media-centric enterprises, so the impact varies depending on the sensitivity of the stored content and the network environment.

Organizations should immediately assess their use of Emby MediaBrowser and identify any instances running version 4.9.0.35. Until an official patch is released, it is advisable to restrict network access to the media server, limiting it to trusted internal networks and VPNs only. Implement network segmentation to isolate the media server from critical systems and sensitive data repositories. Review and tighten user privilege assignments to ensure minimal necessary access, as the vulnerability requires low privileges to exploit. Monitor network traffic for unusual access patterns or data exfiltration attempts related to the media server. Enable and review detailed logging on Emby MediaBrowser to detect unauthorized access attempts. Once a patch becomes available, prioritize its deployment. Additionally, consider alternative media server solutions if immediate patching is not feasible and the risk is unacceptable.