CVE-2025-25236 is an information disclosure vulnerability classified under CWE-204 (Observable Discrepancy Response) found in Omnissa Workspace ONE UEM. The vulnerability arises from inconsistent or distinguishable responses from the system when queried with different inputs, allowing an unauthenticated attacker to enumerate sensitive data such as tenant IDs and user accounts. This enumeration can be leveraged to identify valid accounts and tenant identifiers, which are critical for targeted credential-based attacks like brute-force, password spraying, or credential stuffing. The vulnerability affects multiple versions of Omnissa Workspace ONE UEM prior to 24.10.0.25, 24.6.0.44, and 24.2.0.36, indicating that it spans several recent releases. The CVSS 3.1 base score is 5.3, with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), limited confidentiality impact (C:L), and no impact on integrity or availability (I:N/A:N). This means the vulnerability can be exploited remotely without authentication or user interaction, but the impact is limited to information disclosure. No public exploits are known at this time, but the vulnerability could facilitate further attacks by providing attackers with valuable reconnaissance data. The lack of patch links suggests that organizations should monitor Omnissa advisories for updates and apply patches promptly once available.

For European organizations, the primary impact of CVE-2025-25236 is the potential exposure of sensitive tenant and user account information, which can significantly aid attackers in mounting credential-based attacks. Such attacks can lead to unauthorized access, data breaches, and lateral movement within enterprise environments. Organizations relying on Omnissa Workspace ONE UEM for unified endpoint management may face increased risk of account compromise, especially if multi-factor authentication is not enforced or if password hygiene is poor. The vulnerability does not directly affect system integrity or availability but indirectly increases risk by enabling reconnaissance. Given the widespread use of endpoint management solutions in sectors such as finance, healthcare, and government across Europe, exploitation could lead to significant operational disruptions and data loss. Additionally, the exposure of tenant IDs may facilitate targeted attacks against specific organizations or subsidiaries, increasing the threat landscape complexity. The medium severity rating indicates that while immediate damage is limited, the vulnerability can be a stepping stone for more severe attacks.

European organizations should implement the following specific mitigations: 1) Monitor Omnissa’s official channels for patches addressing CVE-2025-25236 and apply updates to affected Workspace ONE UEM versions as soon as they become available. 2) In the interim, restrict access to the Workspace ONE UEM management interfaces using network segmentation, VPNs, and IP whitelisting to reduce exposure to unauthenticated remote attackers. 3) Implement robust multi-factor authentication (MFA) for all user accounts to mitigate the risk of credential-based attacks facilitated by enumeration. 4) Enhance logging and monitoring to detect unusual authentication attempts, such as rapid login failures or password spraying patterns, and respond promptly. 5) Conduct regular user account audits to identify and disable inactive or unnecessary accounts, reducing the attack surface. 6) Educate users on strong password practices and consider deploying account lockout policies to limit brute-force attempts. 7) Employ web application firewalls (WAFs) or intrusion detection/prevention systems (IDS/IPS) configured to detect and block enumeration attempts based on anomalous request patterns. 8) Review and harden API endpoints and error handling mechanisms to minimize observable discrepancies that could leak information. These targeted measures go beyond generic advice by focusing on reducing the attack surface and detecting exploitation attempts specific to this vulnerability.