CVE-2026-56052: FunnelKit Funnel Builder SQLi Vulnerability

CVE-2026-56052 Overview

CVE-2026-56052 is a blind SQL injection vulnerability in the Funnel Builder by FunnelKit WordPress plugin. The flaw stems from improper neutralization of special elements used in an SQL command [CWE-89]. It affects all versions of Funnel Builder up to and including 3.15.0.5. Exploitation requires high-privilege authentication but can be performed remotely over the network without user interaction. A successful attack allows an authenticated attacker to inject arbitrary SQL queries into the backend database and exfiltrate sensitive data through blind techniques.

Critical Impact
An authenticated attacker with high privileges can perform blind SQL injection against the WordPress database, exposing user records, credentials, and session data while crossing security scope boundaries.

Affected Products

FunnelKit Funnel Builder plugin for WordPress, versions through 3.15.0.5
WordPress sites using vulnerable plugin builds prior to the fixed release
E-commerce funnels relying on the plugin for checkout and lead capture

Discovery Timeline

2026-06-24 - CVE-2026-56052 published to NVD
2026-06-25 - Last updated in NVD database

Technical Details for CVE-2026-56052

Vulnerability Analysis

The vulnerability resides in the FunnelKit Funnel Builder plugin, where user-controlled input is concatenated into an SQL statement without proper sanitization or parameter binding. The plugin processes request parameters and passes them to database queries that interact with WordPress tables. Because the input is not escaped using wpdb->prepare() or equivalent safe APIs, attackers can break out of the intended query context.

The vulnerability is classified as Blind SQL Injection, meaning the application does not directly return query results to the attacker. Instead, attackers infer data through boolean-based or time-based inference techniques. The scope change indicates that exploitation can affect components beyond the vulnerable plugin itself, including the broader WordPress database and any data shared across that instance.

Root Cause

The root cause is improper neutralization of special elements in SQL commands [CWE-89]. The plugin builds SQL queries using string concatenation with attacker-controlled values rather than parameterized statements. WordPress provides wpdb->prepare() to bind parameters safely, but the affected code paths bypass this protection.

Attack Vector

An attacker must first obtain high-privilege credentials on the target WordPress instance, such as administrator or shop manager access. The attacker then issues crafted HTTP requests to a vulnerable endpoint exposed by the Funnel Builder plugin. The injected payload uses boolean conditions or time delays to extract data one bit at a time from the WordPress database. Automated tooling such as sqlmap accelerates the extraction process against blind injection points.

No public proof-of-concept exploit code is currently available. Refer to the Patchstack SQL Injection Advisory for additional technical context.

Detection Methods for CVE-2026-56052

Indicators of Compromise

HTTP requests to Funnel Builder plugin endpoints containing SQL meta-characters such as ', --, UNION, SLEEP(, or BENCHMARK(.
Abnormally long response times from plugin endpoints, suggesting time-based blind injection.
Repeated authenticated requests from a single session iterating through query parameter values.
Unexpected database error entries in PHP or MySQL logs referencing plugin tables.

Detection Strategies

Inspect web server access logs for query strings targeting /wp-admin/admin-ajax.php and FunnelKit plugin routes with SQL syntax patterns.
Deploy a Web Application Firewall (WAF) rule set tuned for WordPress SQL injection signatures.
Enable MySQL general query logging on staging environments to identify malformed statements originating from the plugin.
Correlate authenticated admin sessions with anomalous query volume or response latency spikes.

Monitoring Recommendations

Monitor for privilege escalation events and creation of new administrator accounts following suspicious traffic.
Track outbound data volume from the WordPress host to identify potential exfiltration channels.
Alert on changes to the WordPress wp_users and wp_options tables outside normal administrative workflows.

How to Mitigate CVE-2026-56052

Immediate Actions Required

Update the FunnelKit Funnel Builder plugin to a version newer than 3.15.0.5 as soon as a patched release is published by the vendor.
Audit WordPress user accounts and revoke unnecessary high-privilege roles to reduce the exploitable attack surface.
Rotate database credentials and administrator passwords if exploitation is suspected.
Review recent backups for evidence of unauthorized data access or schema changes.

Patch Information

The vendor advisory tracked by Patchstack identifies vulnerable versions through 3.15.0.5. Administrators should consult the Patchstack SQL Injection Advisory for the fixed version once released and apply the update across all affected WordPress installations.

Workarounds

Restrict access to WordPress administrative interfaces using IP allow-listing and multi-factor authentication.
Deploy a WAF with SQL injection rules in front of the WordPress site to block malicious payloads.
Temporarily disable the Funnel Builder plugin if business operations permit until a patched release is installed.
Enforce least-privilege role assignments to minimize the number of accounts capable of triggering the vulnerable code paths.

bash

# Configuration example: enable WordPress debug logging to capture SQL errors
wp config set WP_DEBUG true --raw
wp config set WP_DEBUG_LOG true --raw
wp config set WP_DEBUG_DISPLAY false --raw