CVE-2025-46389 is a medium-severity vulnerability identified in Emby MediaBrowser version 4.9.0.35. The vulnerability is classified under CWE-620, which pertains to unverified password changes. Specifically, this flaw allows an attacker with limited privileges (PR:L) to change a user's password without proper verification, potentially bypassing authentication controls. The vulnerability is exploitable remotely (AV:N) without requiring user interaction (UI:N), and the attack complexity is low (AC:L), meaning it can be exploited relatively easily by an attacker with some level of access. The CVSS 3.1 base score is 6.5, reflecting a moderate risk primarily due to the impact on integrity (I:H) without affecting confidentiality or availability. The scope remains unchanged (S:U), indicating the vulnerability affects only the vulnerable component without impacting other components. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability arises because the application does not properly verify the legitimacy of password change requests, allowing an attacker with some privileges to escalate their access or compromise other user accounts by changing passwords without proper authorization checks.

For European organizations using Emby MediaBrowser 4.9.0.35, this vulnerability poses a significant risk to the integrity of user accounts and access controls. An attacker exploiting this flaw could change passwords of other users, potentially leading to unauthorized access to media content and associated data. While confidentiality and availability are not directly impacted, the integrity breach could facilitate further attacks, such as privilege escalation or lateral movement within the network if Emby is integrated with broader authentication systems. Organizations relying on Emby for internal or public media streaming services may face service disruption or reputational damage if unauthorized users gain control over accounts. Additionally, compromised accounts could be used to distribute malicious content or conduct further attacks, increasing the overall security risk. Given the remote exploitability and lack of user interaction required, the threat is more pronounced in environments where Emby servers are exposed to untrusted networks or where user privilege separation is weak.

To mitigate this vulnerability, European organizations should first verify if they are running the affected version 4.9.0.35 of Emby MediaBrowser. Immediate steps include restricting network access to the Emby server to trusted internal networks or VPNs to reduce exposure. Implement strict access controls and monitor for unusual password change activities or account modifications. Employ multi-factor authentication (MFA) for user accounts if supported by Emby to add an additional layer of verification beyond passwords. Organizations should also consider isolating Emby services from critical infrastructure to limit potential lateral movement. Since no official patch is currently linked, organizations should stay alert for vendor updates or advisories and apply patches promptly once available. Additionally, reviewing and hardening Emby's configuration settings to enforce stronger authentication policies and logging all administrative actions will aid in early detection and response. Regular audits of user accounts and password policies will further reduce risk.