CVE-2026-25378 identifies a Blind SQL Injection vulnerability in the Nelio AB Testing plugin developed by Nelio Software, affecting all versions up to and including 8.2.4. The vulnerability arises from improper neutralization of special characters in SQL commands, allowing attackers to manipulate backend database queries. Blind SQL Injection means attackers can infer data by observing application behavior or response times without direct data output, making exploitation stealthy but still impactful. The plugin is commonly used in WordPress environments to conduct A/B testing, which involves tracking user interactions and storing test data in a database. An attacker exploiting this flaw could extract sensitive information, alter test data, or potentially escalate attacks to compromise the underlying system. No CVSS score has been assigned yet, and no public exploits are known, but the vulnerability is publicly disclosed and should be treated seriously. The absence of authentication or user interaction requirements increases the risk profile. The vulnerability was reserved and published in early 2026, indicating recent discovery and disclosure. Due to the plugin's integration in marketing and analytics workflows, exploitation could also impact business decision-making processes and customer data privacy.

For European organizations, this vulnerability could lead to unauthorized disclosure of sensitive data stored in the WordPress database, including user information and A/B testing results. Data integrity could be compromised by altering test configurations or results, potentially misleading marketing strategies and business decisions. Availability risks are lower but could arise if attackers execute commands that disrupt database operations. Given the widespread use of WordPress and marketing plugins in Europe, especially among SMEs and digital agencies, the threat could affect a broad range of sectors including e-commerce, finance, and media. Compliance with GDPR and other data protection regulations could be jeopardized if personal data is exposed. The stealthy nature of Blind SQL Injection complicates detection, increasing the risk of prolonged undetected exploitation. The lack of known exploits suggests a window for proactive defense, but also a potential for rapid weaponization once exploit code becomes available.

Organizations should immediately inventory their WordPress installations to identify the use of Nelio AB Testing plugin and its version. Until an official patch is released, implement strict input validation and sanitization on all user inputs related to the plugin, especially those that interact with the database. Deploy Web Application Firewalls (WAFs) with rules targeting SQL Injection patterns to block malicious payloads. Monitor database query logs and application behavior for anomalies indicative of Blind SQL Injection attempts, such as unusual query patterns or timing discrepancies. Limit database user privileges associated with the WordPress application to minimize potential damage from injection attacks. Educate development and security teams about the vulnerability to ensure rapid patch application once available. Consider isolating or disabling the plugin temporarily if critical systems are at risk and no immediate patch exists. Regularly update all WordPress components and maintain backups to enable quick recovery in case of compromise.