CVE-2025-3924 identifies an improper authorization vulnerability (CWE-285) in the PeproDev Ultimate Profile Solutions plugin for WordPress, specifically version 1.9.1. The vulnerability exists in the plugin's reset-password endpoint, which is publicly accessible and accepts a username parameter. When a username is supplied, the plugin returns the associated 'valid_email' value without verifying that the requester is authorized or associated with that user account. This lack of access control allows unauthenticated attackers to enumerate email addresses of any user registered on the WordPress site, including high-privilege administrator accounts. The vulnerability does not require authentication or user interaction, making it remotely exploitable over the network with low complexity. The CVSS v3.1 score is 5.3 (medium severity), reflecting the confidentiality impact due to information disclosure, but no impact on integrity or availability. No patches or fixes are currently linked, and no known exploits have been reported in the wild. This vulnerability can be leveraged by attackers to gather valid email addresses for spear phishing, social engineering, or brute force attacks, increasing the risk of further compromise. The issue stems from the plugin’s failure to implement proper authorization checks on sensitive endpoints, violating secure coding best practices.

The primary impact of CVE-2025-3924 is the unauthorized disclosure of user email addresses, including those of administrators, which compromises user privacy and organizational security. Attackers can use enumerated emails to conduct targeted phishing campaigns, credential stuffing, or social engineering attacks, potentially leading to account takeover or broader network compromise. Although the vulnerability does not directly affect system integrity or availability, the information leakage can serve as a stepping stone for more severe attacks. Organizations relying on the PeproDev Ultimate Profile Solutions plugin are at risk of data exposure and subsequent exploitation. The impact is particularly significant for high-profile or sensitive WordPress sites where administrator emails are valuable targets. The vulnerability’s ease of exploitation and lack of authentication requirements increase the likelihood of automated scanning and enumeration by threat actors. Without mitigation, organizations face increased risk of reputational damage, regulatory non-compliance related to data privacy, and potential financial losses from successful downstream attacks.

To mitigate CVE-2025-3924, organizations should first verify if they are running PeproDev Ultimate Profile Solutions version 1.9.1. If so, immediate steps include disabling or restricting access to the reset-password endpoint to prevent unauthenticated requests. Implementing web application firewall (WAF) rules to block or rate-limit requests to this endpoint can reduce exposure. Monitoring web server logs for unusual access patterns targeting the reset-password functionality can help detect exploitation attempts. Since no official patch is currently available, contacting the plugin vendor for updates or applying custom code fixes to enforce authorization checks on the endpoint is critical. Additionally, organizations should educate users and administrators about phishing risks and enforce multi-factor authentication (MFA) to mitigate the impact of compromised credentials. Regularly auditing installed plugins and minimizing the use of unnecessary or outdated plugins reduces attack surface. Finally, maintaining up-to-date backups and incident response plans ensures preparedness in case of compromise.