What’s Vulnerable › Vulnerabilities

CVE-2025-3605: Frontend Login and Registration Blocks <= 1.1.1 - Unauthenticated Privilege Escalation via Account Takeover

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-05-09 · updated 2026-06-17
• Weakness: CWE-639

Description

The Frontend Login and Registration Blocks plugin for WordPress is vulnerable to privilege escalation via account takeover in all versions up to, and including, 1.1.1. This is due to the plugin not properly validating a user's identity prior to updating their details like email via the flr_blocks_user_settings_handle_ajax_callback() function. This makes it possible for unauthenticated attackers to change arbitrary user's email addresses, including administrators, and leverage that to reset the user's password and gain access to their account.

Affected products

• arkenon Login, Registration and Lost Password Blocks: through 1.1.1

References

• 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

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