CVE-2025-3607 is a vulnerability identified in the Frontend Login and Registration Blocks plugin for WordPress, developed by arkenon. This vulnerability affects all versions up to and including 1.0.7. The core issue stems from improper validation of a user's identity before allowing a password update. Specifically, the plugin fails to verify that the user requesting a password change is authorized to do so for the targeted account. As a result, an authenticated attacker with at least Subscriber-level access can exploit this flaw to change the password of any user, including administrators. This effectively enables privilege escalation through account takeover, as the attacker can reset the password of higher-privileged accounts and gain unauthorized access. The vulnerability is classified under CWE-620 (Unverified Password Change), indicating a failure in verifying user identity during sensitive operations. Although no public exploits have been reported yet, the vulnerability presents a significant risk due to the widespread use of WordPress and the plugin in question. The lack of proper authentication checks during password changes undermines the integrity and confidentiality of user accounts, potentially leading to full site compromise if administrative accounts are targeted. The vulnerability was reserved on April 14, 2025, and publicly disclosed on April 24, 2025. No official patches or updates have been linked at the time of this analysis, increasing the urgency for mitigation measures.

For European organizations, the impact of CVE-2025-3607 can be substantial, especially for those relying on WordPress websites that utilize the Frontend Login and Registration Blocks plugin. Successful exploitation allows attackers with minimal privileges to escalate their access to administrative levels, compromising the confidentiality, integrity, and availability of the affected websites. This can lead to unauthorized data access, defacement, insertion of malicious content, or use of the compromised site as a launchpad for further attacks such as phishing or malware distribution. Organizations in sectors with high regulatory requirements, such as finance, healthcare, and government, face additional risks including non-compliance with data protection laws like GDPR, which can result in significant fines and reputational damage. Moreover, the ease of exploitation—requiring only authenticated access at Subscriber level—means that attackers can leverage compromised or created low-privilege accounts to escalate privileges without needing to bypass complex security controls. The scope is broad given the plugin's availability and use in WordPress installations across Europe, potentially affecting small to large enterprises, public institutions, and e-commerce platforms. The absence of known exploits in the wild currently offers a window for proactive defense, but the medium severity rating underscores the need for immediate attention to prevent exploitation.

1. Immediate mitigation should focus on restricting Subscriber-level account creation and monitoring for suspicious account activity, as attackers require at least this level of access to exploit the vulnerability. 2. Implement multi-factor authentication (MFA) for all user accounts, particularly administrative ones, to reduce the risk of account takeover even if passwords are changed maliciously. 3. Conduct an audit of all user accounts to identify and remove any unauthorized or suspicious Subscriber-level accounts. 4. Monitor logs for unusual password change requests or account modifications, especially those initiated by low-privilege users. 5. Until an official patch is released, consider disabling or replacing the Frontend Login and Registration Blocks plugin with alternative solutions that properly validate password changes. 6. Apply the principle of least privilege by limiting the number of users with elevated permissions and regularly reviewing user roles. 7. Educate site administrators and users about the risks of this vulnerability and encourage prompt reporting of any suspicious activity. 8. Prepare an incident response plan specifically addressing potential account takeover scenarios to enable rapid containment and recovery. 9. Stay updated with vendor communications for any forthcoming patches or security advisories and apply them immediately upon release.