CVE-2025-6027 is an authentication bypass vulnerability categorized under CWE-287, affecting the Ace User Management WordPress plugin through version 2.0.3. The core issue is that the plugin fails to properly validate that a password reset token corresponds to the user who requested it. Normally, password reset tokens are unique and tied to a specific user to prevent unauthorized resets. However, due to this flaw, any authenticated user, even those with minimal privileges such as subscribers, can exploit the token validation logic to reset passwords of other users, including administrators. This improper authentication allows privilege escalation and unauthorized account takeover. The vulnerability is remotely exploitable over the network (AV:N), requires low attack complexity (AC:L), and only requires privileges of a low-level authenticated user (PR:L). No user interaction is needed (UI:N), and the scope is unchanged (S:U). The impact affects confidentiality, integrity, and availability at a low level (C:L/I:L/A:L), resulting in a CVSS v3.1 base score of 6.3 (medium severity). No patches or known exploits are currently available, but the risk remains significant for sites relying on this plugin for user management. Attackers could leverage this flaw to gain control over high-privilege accounts, leading to further compromise of WordPress sites.

For European organizations, this vulnerability poses a risk of unauthorized privilege escalation within WordPress environments using the Ace User Management plugin. Attackers with any authenticated user account can reset passwords of administrators, potentially gaining full control over the website. This can lead to data breaches, defacement, insertion of malicious content, or use of the compromised site as a launchpad for further attacks. Organizations relying on WordPress for critical business functions or customer-facing portals may face reputational damage, regulatory non-compliance (e.g., GDPR), and operational disruptions. The medium severity rating reflects that while exploitation requires authentication, the ease of privilege escalation and potential for administrative takeover make this a significant threat. The absence of known exploits currently provides a window for proactive mitigation, but the vulnerability should be addressed promptly to avoid future exploitation.

European organizations should immediately audit their WordPress installations to identify the presence of the Ace User Management plugin and its version. Until an official patch is released, consider the following mitigations: 1) Restrict user registrations and limit authenticated user roles to trusted personnel only; 2) Implement additional monitoring and alerting for password reset activities, especially those initiated by low-privileged users; 3) Temporarily disable or uninstall the Ace User Management plugin if feasible; 4) Enforce strong multi-factor authentication (MFA) for administrator accounts to reduce the impact of compromised credentials; 5) Review and tighten WordPress user role assignments to minimize the number of users with authenticated access; 6) Keep WordPress core and all plugins updated to reduce exposure to other vulnerabilities; 7) Prepare to apply patches promptly once available from the plugin vendor or community. Additionally, conduct regular security audits and penetration tests focusing on authentication mechanisms.