CVE-2025-24587 identifies a Blind SQL Injection vulnerability in the Nks Email Subscription Popup plugin, affecting versions up to and including 1.2.23. The vulnerability stems from improper neutralization of special elements in SQL commands, allowing attackers to inject arbitrary SQL statements into backend database queries. Blind SQL Injection means attackers cannot directly see the results of their queries but can infer data through timing or boolean-based techniques. This flaw enables attackers to extract sensitive information, modify or delete data, or escalate privileges within the database. The plugin is typically used on websites to manage email subscriptions, making it a common target for attackers seeking to compromise user data or site integrity. No CVSS score has been assigned yet, and no known exploits are reported in the wild, but the vulnerability is publicly disclosed and documented. The lack of patches at the time of disclosure increases risk for unpatched systems. Exploitation requires sending crafted HTTP requests to the vulnerable plugin endpoints, with no user interaction needed. The vulnerability affects the confidentiality and integrity of data, and potentially the availability if database corruption occurs. The plugin's market penetration is primarily among WordPress users, which is widespread globally, especially in countries with large web hosting and e-commerce sectors.

The potential impact of CVE-2025-24587 is significant for organizations using the Nks Email Subscription Popup plugin. Successful exploitation could lead to unauthorized disclosure of sensitive subscriber data, including email addresses and possibly other personal information stored in the database. Attackers might also alter or delete subscription data, disrupting marketing and communication efforts. In worst cases, attackers could leverage the vulnerability to escalate privileges within the database or pivot to other parts of the web application infrastructure. This could result in broader data breaches, reputational damage, regulatory penalties, and financial loss. Since the vulnerability is a Blind SQL Injection, exploitation may be stealthy and prolonged, making detection difficult. Organizations relying on this plugin for customer engagement or lead generation are at risk of operational disruption and loss of customer trust. The absence of known exploits currently provides a window for mitigation, but the public disclosure increases the likelihood of future attacks.

To mitigate CVE-2025-24587, organizations should immediately verify if they are using the Nks Email Subscription Popup plugin version 1.2.23 or earlier and plan to upgrade to a patched version once released by the vendor. In the absence of an official patch, consider temporarily disabling the plugin or restricting access to its endpoints via web server configuration or firewall rules. Implement a Web Application Firewall (WAF) with SQL injection detection and prevention capabilities to block malicious payloads targeting the plugin. Conduct thorough input validation and sanitization on all user-supplied data related to email subscription forms. Monitor web server and application logs for unusual or suspicious requests that may indicate attempted exploitation. Regularly back up databases and test restoration procedures to minimize impact in case of data corruption. Engage in vulnerability scanning and penetration testing focused on SQL injection vectors to identify and remediate similar issues proactively. Finally, educate development and security teams about secure coding practices to prevent injection flaws in custom or third-party plugins.