CVE-2025-1564 is an authentication bypass vulnerability classified under CWE-288, affecting the SetSail Membership plugin for WordPress developed by Select-Themes. The vulnerability exists in all versions up to and including 1.0.3 due to improper verification of user identity during the social login process. Specifically, the plugin does not adequately validate the authenticity of the social login tokens or the linkage between the social login and the WordPress user account. This flaw allows unauthenticated attackers to bypass normal authentication mechanisms and log in as any user, including those with administrative privileges. The exploitation requires no user interaction and no prior authentication, making it trivially exploitable remotely over the network. The impact includes full compromise of user accounts, potential site takeover, data theft, and manipulation of site content or settings. The vulnerability has a CVSS v3.1 base score of 9.8, indicating critical severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. Although no known exploits are currently reported in the wild, the vulnerability's nature and ease of exploitation make it a high-risk threat for WordPress sites using this plugin. The lack of an available patch at the time of publication increases urgency for mitigation.

The impact of CVE-2025-1564 is severe for organizations using the SetSail Membership plugin. Attackers can gain unauthorized access to any user account, including administrators, leading to full site compromise. This can result in data breaches, unauthorized content changes, defacement, installation of backdoors or malware, and disruption of services. Membership sites relying on this plugin for user management and access control are particularly vulnerable to fraud, data theft, and loss of customer trust. The vulnerability threatens confidentiality by exposing user data, integrity by allowing unauthorized modifications, and availability by potentially enabling denial-of-service through administrative control. Given WordPress's widespread use globally, the vulnerability could affect a large number of websites, especially those in sectors like e-commerce, education, and membership-based services where the plugin is deployed.

Organizations should immediately verify if they use the SetSail Membership plugin and identify the version in use. Since no official patch is currently available, temporary mitigations include disabling the social login feature or the plugin entirely until a fix is released. Restricting access to the WordPress admin area via IP whitelisting or VPN can reduce exposure. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block suspicious login attempts related to social login endpoints can help mitigate exploitation. Monitoring authentication logs for unusual login patterns or multiple failed attempts is critical. Once a patch is released, prioritize prompt updating of the plugin. Additionally, enforcing multi-factor authentication (MFA) on WordPress accounts can provide an extra layer of defense against unauthorized access. Regular backups and incident response plans should be reviewed and updated in case of compromise.