CVE-2025-58969 is a medium-severity vulnerability classified under CWE-862 (Missing Authorization) affecting the Greg Winiarski Custom Login URL plugin, versions up to 1.0.2. This vulnerability arises due to improperly configured access control mechanisms, allowing unauthorized users to exploit the login URL functionality without proper authorization checks. Specifically, the flaw enables attackers to bypass intended security levels and potentially perform unauthorized actions that impact the integrity of the system. The CVSS 3.1 base score is 5.3, reflecting a medium risk with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, meaning the vulnerability is remotely exploitable over the network without any privileges or user interaction, and it impacts the integrity of the system but not confidentiality or availability. The vulnerability does not have known exploits in the wild yet, and no official patches have been linked at the time of publication. The root cause is an incorrect or missing authorization check in the plugin's handling of custom login URLs, which could allow attackers to manipulate or gain unauthorized access to certain functionalities or data modifications that should be restricted. Since this plugin is typically used to customize login URLs for WordPress sites, exploitation could lead to unauthorized changes or actions within the authentication process or related workflows, undermining the integrity of user sessions or authentication logic.

For European organizations, the impact of this vulnerability could be significant, especially for those relying on WordPress sites using the Greg Winiarski Custom Login URL plugin. Unauthorized modification or manipulation of login URLs can lead to unauthorized access attempts, session hijacking, or privilege escalation scenarios, potentially compromising user accounts or administrative controls. While confidentiality and availability are not directly impacted, the integrity compromise could enable attackers to alter authentication flows or user permissions, leading to further exploitation or lateral movement within the network. Organizations in sectors with strict regulatory requirements around data integrity and access control, such as finance, healthcare, and government, may face compliance risks if this vulnerability is exploited. Additionally, since the vulnerability requires no authentication or user interaction, it can be exploited remotely, increasing the attack surface and risk of automated exploitation attempts. The absence of known exploits in the wild currently reduces immediate risk, but the medium severity and ease of exploitation warrant proactive mitigation to prevent future attacks.

To mitigate CVE-2025-58969, European organizations should first identify if they are using the Greg Winiarski Custom Login URL plugin on any WordPress installations. Immediate steps include disabling or removing the plugin if it is not essential. For sites that require this functionality, organizations should monitor for updates or patches from the vendor and apply them promptly once available. In the interim, implementing strict web application firewall (WAF) rules to restrict access to login URL endpoints and monitor for suspicious requests can reduce exposure. Additionally, organizations should enforce multi-factor authentication (MFA) on all user accounts to mitigate the impact of unauthorized access attempts. Regular security audits and access control reviews should be conducted to ensure no unauthorized changes have occurred. Network segmentation and limiting administrative access to trusted IP ranges can further reduce risk. Finally, organizations should maintain robust logging and alerting mechanisms to detect any anomalous activity related to login URL access or authentication flows.