CVE-2025-3607 Overview
CVE-2025-3607 is a privilege escalation vulnerability in the Frontend Login and Registration Blocks plugin for WordPress. The flaw affects all versions up to and including 1.0.8. The plugin fails to validate a user's identity before processing password updates through its lost password functionality. Authenticated attackers with Subscriber-level access or above can change passwords for arbitrary users, including administrators. Successful exploitation results in full account takeover and complete site compromise. The weakness is tracked as [CWE-620: Unverified Password Change].
Critical Impact
Authenticated attackers with low-privilege accounts can reset administrator passwords and seize full control of affected WordPress sites.
Affected Products
- Frontend Login and Registration Blocks plugin for WordPress, versions ≤ 1.0.8
- WordPress installations with the plugin active and user registration enabled
- Sites permitting Subscriber-level or higher account creation
Discovery Timeline
- 2025-04-24 - CVE-2025-3607 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-3607
Vulnerability Analysis
The vulnerability resides in the lost password handler implemented in class-flr-blocks-lost-password.php. The plugin exposes a password reset routine that updates a target account's credentials without verifying the requesting user owns that account. An authenticated attacker submits a crafted request specifying a victim user identifier and a new password. The plugin processes the update and applies the supplied password to the target account. The flaw enables horizontal and vertical privilege escalation because no role restriction limits which accounts can be reset. See the WordPress Plugin Code Review for the affected source location.
Root Cause
The root cause is missing identity verification before password modification. The handler trusts user-supplied parameters that designate which account to update. It does not confirm the authenticated session belongs to that target account. It also omits the standard WordPress password reset key validation used by the core retrieve_password() and reset_password() workflow. This pattern matches [CWE-620], where a password change occurs without checking the original password or a valid reset token.
Attack Vector
An attacker first registers a Subscriber account on a vulnerable site, which is the default role on most WordPress installations allowing open registration. The attacker authenticates and then submits the plugin's password reset endpoint with parameters referencing the administrator account and a chosen password. The plugin updates the administrator credentials. The attacker logs in with the new password and obtains full administrative control. The Wordfence Vulnerability Report documents the exploitation conditions.
Detection Methods for CVE-2025-3607
Indicators of Compromise
- Unexpected password change events for administrator or editor accounts in WordPress user metadata
- New administrator accounts created shortly after a low-privilege user authenticates
- Plugin or theme installations performed by accounts that recently had passwords reset
- Login activity from Subscriber accounts immediately preceding administrator credential changes
Detection Strategies
- Audit the wp_users table for user_pass modifications correlated with low-privilege user sessions
- Monitor web server logs for POST requests to the plugin's lost password handler containing user identifier parameters
- Alert on password_reset actions where the requesting authenticated user differs from the target account
Monitoring Recommendations
- Forward WordPress audit logs and web server access logs to a centralized SIEM for correlation
- Track authentication events and privilege role changes on all WordPress endpoints
- Implement file integrity monitoring on the wp-content/plugins/frontend-login-and-registration-blocks/ directory
How to Mitigate CVE-2025-3607
Immediate Actions Required
- Update the Frontend Login and Registration Blocks plugin to a version higher than 1.0.8
- Disable the plugin if an updated version cannot be applied immediately
- Force a password reset for all administrator and elevated-privilege accounts
- Review user lists for unauthorized administrator accounts and remove them
Patch Information
The vendor addressed the issue in the changeset published on the WordPress plugin repository. Refer to the WordPress Changeset Update and the WordPress Changeset File Changes for the specific code modifications introducing identity verification before password updates.
Workarounds
- Disable open user registration in WordPress Settings to remove the prerequisite Subscriber access
- Restrict access to the plugin's lost password endpoint at the web server or WAF layer until patched
- Enforce multi-factor authentication on administrator accounts to limit takeover impact
# Disable user registration via wp-config.php or wp-cli
wp option update users_can_register 0
# Deactivate the vulnerable plugin until patched
wp plugin deactivate frontend-login-and-registration-blocks
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
