CVE-2025-3607: Privilege Escalation via Account Takeover in WordPress Frontend Login and Registration Blocks Plugin

Overview

A significant vulnerability, designated as CVE-2025-3607, has been identified in the Frontend Login and Registration Blocks plugin for WordPress. This vulnerability poses a substantial threat to the security of WordPress websites, which are used by a vast number of businesses and individuals worldwide. The flaw’s severity results from its potential to enable an attacker to escalate their privileges by taking over user accounts, even those of administrators. If exploited, this vulnerability could lead to system compromise or data leakage, making it a critical issue that requires immediate attention and remediation.

Vulnerability Summary

CVE ID: CVE-2025-3607
Severity: High (8.8 CVSS Severity Score)
Attack Vector: Network
Privileges Required: Low (Subscriber-level access)
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Frontend Login and Registration Blocks plugin for WordPress | All versions up to and including 1.0.7

How the Exploit Works

The vulnerability arises from the plugin’s failure to adequately validate a user’s identity prior to updating a password. This flaw allows an attacker, who has gained at least Subscriber-level access, to change the password of any user, even those with administrative privileges. The attacker can then leverage this ability to gain unauthorized access to the affected account, potentially compromising the system or leaking sensitive data.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. It is pseudocode and should not be taken as an actual exploit script.

POST /wp-login.php?action=lostpassword HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
user_login=target_admin&redirect_to=&wp-submit=Get+New+Password

In the above example, the attacker sends a password reset request for the `target_admin` user. Due to the lack of proper identity verification, the system processes this request, enabling the attacker to reset the password and gain access to the `target_admin` account.

Available Mitigations

To mitigate this vulnerability, users are advised to immediately apply the patch provided by the vendor. If a patch is not immediately available or cannot be applied in a timely manner, a web application firewall (WAF) or intrusion detection system (IDS) can serve as temporary mitigation, helping to identify and block potential exploit attempts.