Attack Vectors

This medium-severity vulnerability (CVSS 4.9) affects the WordPress plugin Nelio A/B Testing – AB Tests and Heatmaps for Better Conversion Optimization (slug: nelio-ab-testing) in versions up to and including 8.2.4.

The issue is an authenticated SQL Injection, meaning an attacker must already have access to the WordPress admin area with Editor-level permissions or higher. In practical terms, this can be exploited when an Editor (or higher) account is compromised (phishing, password reuse, credential stuffing) or when an organization grants Editor access too broadly (e.g., agencies, contractors, temporary staff).

Once the attacker has the required authenticated access, the vulnerability can be triggered remotely over the network without user interaction, enabling database data to be targeted from within normal-looking administrative activity.

Security Weakness

CVE-2026-25378 is caused by insufficient escaping of a user-supplied parameter and a lack of sufficient preparation of an existing SQL query in Nelio AB Testing (through 8.2.4). According to the reported details, this can allow an authenticated attacker (Editor+) to append additional SQL to existing queries.

While the required privilege level reduces the likelihood compared to public/unauthenticated issues, the risk remains meaningful for businesses because Editor accounts are common targets and are frequently held by non-technical users who may be more exposed to phishing attempts.

Source: Wordfence vulnerability record.

Technical or Business Impacts

The primary impact of this SQL Injection is data exposure (high confidentiality impact per the CVSS vector). An attacker may be able to extract sensitive information from the WordPress database. Depending on what your site stores, this could include customer or lead data, internal user information, order records, or other business-sensitive content.

From a business-risk perspective, potential outcomes include regulatory and contractual exposure (e.g., privacy obligations), brand damage if customer data is accessed, and operational disruption associated with incident response, forensics, mandatory notifications, and rebuilding trust with customers and partners.

Remediation status: There is no known patch available in the provided advisory. Organizations should assess risk tolerance and consider mitigation steps such as uninstalling the affected plugin and replacing it with an alternative, reducing the number of Editor+ accounts, tightening admin access controls, and increasing monitoring for unusual administrative behavior.

Similar Attacks

SQL Injection has a long history of being used to access sensitive databases and trigger major business incidents. Examples include:

Drupal “Drupalgate” (CVE-2014-3704) — a widely exploited SQL injection vulnerability that led to large-scale site compromises.
2015 TalkTalk data breach — publicly reported as involving SQL injection, resulting in significant regulatory, financial, and reputational impact.