CVE-2025-64113 identifies a critical security vulnerability in Emby Server, a popular user-installable home media server software. The vulnerability stems from a weak password recovery mechanism classified under CWE-640, which allows attackers to bypass authentication controls and gain full administrative access to the Emby Server application interface. This access is limited to the application level and does not extend to the underlying operating system. The vulnerability requires only network access to the server, with no prerequisites such as user interaction or prior authentication, making it highly exploitable remotely. The weakness in the password recovery process likely involves insufficient verification steps or predictable recovery tokens, enabling attackers to reset or retrieve administrative credentials. The issue affects all Emby Server versions below 4.9.1.81, with the vendor having addressed the flaw in that release. The CVSS 4.0 base score is 9.3 (critical), reflecting the vulnerability's ease of exploitation (network attack vector, no privileges or user interaction required) and its severe impact on confidentiality, integrity, and availability of the Emby Server administration. Although no known exploits are reported in the wild yet, the vulnerability's characteristics suggest it could be rapidly weaponized. Organizations running vulnerable Emby Servers risk unauthorized administrative control, which could lead to data exposure, manipulation of media content, and potential pivoting to other internal systems if the server is connected to broader networks.

For European organizations, the impact of CVE-2025-64113 can be significant, especially for those using Emby Server to manage media content in corporate environments, educational institutions, or media companies. Unauthorized administrative access could lead to exposure of sensitive user data, including personal media libraries and user credentials stored within the application. Attackers could manipulate or delete media content, disrupt service availability, or use the compromised server as a foothold for lateral movement within the network. This is particularly concerning for organizations with weak network segmentation or those exposing Emby Server interfaces to the internet. The breach of confidentiality and integrity could also damage organizational reputation and lead to compliance issues under GDPR if personal data is involved. Although the vulnerability does not grant OS-level access, the administrative control over the application can still facilitate further attacks or data exfiltration. The lack of required authentication and user interaction increases the risk of automated exploitation campaigns targeting vulnerable servers across Europe.

1. Immediate upgrade of all Emby Server installations to version 4.9.1.81 or later to apply the official patch addressing the weak password recovery mechanism. 2. Restrict network access to the Emby Server administration interface by implementing firewall rules or VPN access controls, limiting exposure to trusted internal networks only. 3. Employ network segmentation to isolate media servers from critical infrastructure and sensitive data repositories. 4. Monitor network traffic for unusual access patterns or repeated password recovery attempts targeting Emby Server endpoints. 5. Implement multi-factor authentication (MFA) for Emby Server administration if supported, adding an additional layer of security beyond password recovery. 6. Regularly audit user accounts and administrative privileges within Emby Server to detect unauthorized changes. 7. Educate users and administrators about the risks associated with password recovery features and encourage strong password policies. 8. Consider deploying web application firewalls (WAF) with custom rules to detect and block exploitation attempts targeting the password recovery process. 9. Maintain up-to-date backups of media server configurations and content to enable recovery in case of compromise.