WordPress CTA Plugin SQL Injection via Unauthenticated Parameter

The WP CTA – Sticky CTA Builder, Generate Leads, Promote Sales plugin for WordPress is vulnerable to time-based blind SQL Injection via the 'fildname' parameter in all versions up to, and including, 2.2.2. This is due to insufficient escaping of user-supplied column names in the ajaxCheck() method and lack of preparation in the $wpdb->update() call. The vulnerability is compounded by the complete absence of authorization checks and the endpoint being registered for unauthenticated users via wp_ajax_nopriv_. This makes it possible for unauthenticated attackers to inject arbitrary SQL queries and extract sensitive information from the database via time-based blind SQL injection techniques, including administrator password hashes.

Casky was already ahead

This CVE exploits attack patterns that Casky's 322matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The WP CTA – Sticky CTA Builder plugin for WordPress contains a critical time-based blind SQL injection vulnerability in versions up to 2.2.2, exploitable through the 'fildname' parameter in the ajaxCheck() method. The vulnerability stems from insufficient escaping of user-supplied column names combined with improper use of $wpdb->update(), allowing attackers to execute arbitrary SQL queries. This is particularly severe because the vulnerable endpoint is registered for unauthenticated users, meaning any visitor—without needing credentials—can exploit it to extract sensitive data, modify database contents, or potentially achieve remote code execution. WordPress sites running this plugin with default configurations face immediate risk to their database integrity and confidential information.

Casky's 322 mapped security skills leverage Claude AI's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would see detections for: (1) suspicious HTTP requests with SQL metacharacters in the 'fildname' parameter showing time-delay patterns indicating blind SQL injection attempts; (2) unauthenticated access to admin-ajax.php endpoints with CWE-89 SQL injection signatures; (3) database query timing anomalies and unusual UNION-based or time-based payloads; and (4) reconnaissance activity mapping WordPress plugin versions and database schemas. The extended reasoning capability helps correlate multiple weak signals—such as repeated parameter fuzzing, response time variations, and error message leakage—into high-confidence attack chain detection that traditional signatures might miss.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

322 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-4661.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

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