CVE-2025-3605 Scanner

WordPress Frontend Login and Registration Blocks Plugin is extensively utilized by website administrators to facilitate user authentication and registration tasks efficiently within WordPress environments. This plugin enables convenient user management by allowing visitors to register and log in through customizable front-end interfaces. It finds application among developers and site managers aiming to enhance user engagement by seamlessly integrating login functionalities into site pages. By catering to a user-friendly interface, it demonstrates widespread applicability in personal blogs, corporate websites, and e-commerce platforms relying on WordPress. Web administrators often favor this plugin for its ease of integration and flexibility in handling registration workflows. Overall, it remains an important tool for managing user access and activity in WordPress hosting environments.

Privilege escalation as detected within the WordPress Frontend Login and Registration Blocks Plugin presents significant security risks. This vulnerability occurs when an unauthorized user is capable of gaining admin privileges without proper validation processes. Essentially, it allows attackers to alter critical settings or obtain higher access levels clandestinely. A notable aspect is its occurrence through improperly safeguarded AJAX endpoints permitting unauthorized modifications to administrative email addresses. When successfully exploited, it culminates in high-impact consequences including unauthorized admin account access and potential site takeover. Addressing this vulnerability is crucial to prevent exploitation and maintain the integrity of WordPress sites employing this plugin.

Technical exploits linked with this vulnerability involve accessing the AJAX endpoint `flr_blocks_user_settings_handle_ajax_callback()` without authentication controls. This endpoint allows attackers to change the administrator's email address, subsequently enabling the use of password reset functions to gain control over admin accounts. The HTTP POST request to `admin-ajax.php` with manipulated parameters like `action=flrblocksusersettingsupdatehandle&user_id={{userid}}&flr-blocks-email-update={{email}}` reveals the weakness. Given the simplistic attack vector involving well-crafted POST requests, protection revolves around strengthening endpoint security and ensuring authentication checks. Understanding precise endpoints and request manipulations provides insight into potential safeguard implementations.

Once exploited, privilege escalation could yield devastating effects on victim websites. Unauthorized access to admin accounts could enable attackers to compromise sensitive data, alter website configurations, or inject malicious content. The manipulation of email addresses effectively paves the way for altering credentials, thereby potentially resulting in complete control over WordPress environments. At a broader scope, this could facilitate staging further attacks against site users, leading to data breaches or disruptions in service availability. Consequently, website administrators face risks like data theft, defacement, and increased vulnerability to malicious campaigns, which necessitate urgent remediation action.

REFERENCES

• https://wordpress.org/plugins/frontend-login-and-registration-blocks/
• https://github.com/GadaLuBau1337/CVE-2025-3605/tree/main
• https://nvd.nist.gov/vuln/detail/CVE-2025-3605
• https://plugins.trac.wordpress.org/browser/frontend-login-and-registration-blocks/trunk/inc/class-flr-blocks-user-settings.php#L59
• https://www.wordfence.com/threat-intel/vulnerabilities/id/0c11668c-6dc3-4539-b2be-bf6528bed73e?source=cve