CVE-2026-56052: Blind SQL Injection in FunnelKit Funnel Builder – CVSS 7.6 HIGH

Technical summary

CVE-2026-56052 is a blind SQL injection flaw (CWE-89) in FunnelKit Funnel Builder's input validation logic. The vulnerability stems from improper neutralization of special characters in SQL commands, allowing authenticated administrators to inject malicious SQL syntax. Blind SQL injection means the attacker cannot directly observe query results but can infer data through response-time variations, error messages, or conditional logic. The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:C) indicates network-accessible exploitation requiring high privilege level, with potential for confidentiality breach and limited availability impact.

Business impact

Compromise of this vulnerability by a malicious insider or through credential theft could result in unauthorized database access, exfiltration of sensitive customer or business data stored in the funnel builder's backend, and potential manipulation of funnel configurations. Organizations relying on FunnelKit for customer engagement workflows face reputational risk if customer data is exposed. The attack requires high privilege, limiting exposure to trusted administrators and accounts with admin-level access.

Affected systems

FunnelKit Funnel Builder versions from the earliest tracked version through 3.15.0.5 are affected. Organizations running instances at or below version 3.15.0.5 should treat this as a priority. Verify your exact installed version in the FunnelKit admin panel and check the official vendor advisory for a patched release.

Exploitability

Exploitation requires high-privilege administrator access, which significantly reduces real-world attack surface compared to unauthenticated vulnerabilities. The attack is not trivial—blind SQL injection typically requires automated tools or scripting to infer data—but remains feasible. There is currently no evidence of this vulnerability being exploited in the wild (not listed on CISA's Known Exploited Vulnerabilities catalog), though this should not delay patching given the data-access risk.

Remediation

Apply the latest version of FunnelKit Funnel Builder released after 3.15.0.5. Consult the official FunnelKit release notes or vendor advisory to identify the specific patched version. In parallel, implement defense-in-depth controls: restrict administrative access using principle of least privilege, enforce strong password policies and multi-factor authentication for admin accounts, audit database and application logs for unusual SQL query patterns, and review user activity logs for suspicious admin actions.

Patch guidance

Contact FunnelKit support or check your FunnelKit account dashboard for available updates. Verify the patched version number against the official FunnelKit advisory before deploying to production. Test the update in a non-production environment first to ensure compatibility with your funnel configurations and any custom extensions. If automatic updates are enabled, confirm the update has been applied and restart any necessary services.

Detection guidance

Monitor application and database logs for SQL keywords (UNION, SELECT, OR, etc.) appearing in funnel builder parameters or configuration inputs. Enable SQL query logging at the database level if possible to capture and alert on unusual query patterns. Review admin access logs for unexpected logins or changes to sensitive funnel settings. Implement Web Application Firewall (WAF) rules to detect and block common SQL injection payloads before they reach the application.

Why prioritize this

Although the CVSS score of 7.6 (HIGH) reflects the severity, prioritization should account for the high-privilege requirement. If your organization maintains strict admin access controls and monitors admin accounts closely, the effective risk is lower. However, organizations with relaxed admin credential hygiene or decentralized admin roles should treat this as urgent. Patch within 30 days as part of routine security updates; escalate to 1-2 weeks if admin accounts are known to be at higher compromise risk.

Risk score, explained

The CVSS 3.1 score of 7.6 (HIGH) reflects a network-accessible SQL injection with high potential confidentiality impact (C:H) and limited availability impact (A:L), but tempered by the requirement for high privilege (PR:H) and no user interaction (UI:N). The scope change (S:C) indicates the vulnerability can affect resources beyond the vulnerable component itself. The score appropriately penalizes the risk of unauthorized data access while recognizing that exploitation is constrained to privileged users.

Frequently asked questions