CVE-2026-87781: LTL Freight Quotes SQLi Vulnerability

CVE-2026-87781 Overview

CVE-2026-87781 is an unauthenticated SQL injection vulnerability in the LTL Freight Quotes WordPress plugin before version 4.2.19. The plugin fails to sanitize and escape a user-supplied parameter before including it in a SQL statement. Attackers can send crafted requests to the vulnerable endpoint without authentication and manipulate backend database queries. The flaw is classified as [CWE-89] Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact
Unauthenticated attackers can extract sensitive database contents from affected WordPress sites running the LTL Freight Quotes plugin before 4.2.19.

Affected Products

LTL Freight Quotes WordPress plugin versions prior to 4.2.19
WordPress installations using the vulnerable plugin
Downstream sites exposing the plugin's query parameters to the public internet

Discovery Timeline

2026-10-10 - CVE-2026-87781 published to the National Vulnerability Database
2026-10-13 - Last updated in NVD database

Technical Details for CVE-2026-87781

Vulnerability Analysis

The LTL Freight Quotes plugin accepts a request parameter and passes it into a SQL statement without sanitization or escaping. Because the plugin does not use prepared statements or wpdb::prepare() with placeholders, attacker-controlled input modifies the query's logical structure. The vulnerability requires no authentication, meaning any unauthenticated visitor can reach the vulnerable code path. Successful exploitation allows database content extraction through UNION-based or boolean-based inference techniques typical of SQL injection against WordPress plugins.

The scope-changed vector indicates that exploitation impacts resources beyond the vulnerable component, which is consistent with reading data from the shared WordPress database that may host multiple applications or sensitive customer records tied to freight-quote workflows.

Root Cause

The root cause is missing input sanitization and query parameterization in the plugin's SQL handling logic. Developer code concatenates untrusted request input directly into a query string. WordPress provides $wpdb->prepare() for safe parameter binding, but the vulnerable code path does not use it. See the WPScan Vulnerability Report for the specific parameter and endpoint details.

Attack Vector

An attacker sends an HTTP request to the vulnerable plugin endpoint with a malicious payload in the affected parameter. Because the endpoint is accessible without authentication, the attack can be launched from any internet-connected host. The attacker can enumerate database tables, extract WordPress user credentials from wp_users, retrieve session tokens, or exfiltrate order and quote data. No user interaction is required.

// No verified exploit code is published. Refer to the WPScan advisory for technical reproduction details:
// https://wpscan.com/vulnerability/e600ef26-5aec-4e4a-96be-d67875c337a0/

Detection Methods for CVE-2026-87781

Indicators of Compromise

HTTP requests to LTL Freight Quotes plugin endpoints containing SQL syntax such as UNION SELECT, SLEEP(, BENCHMARK(, or ' OR 1=1--
Unexpected SELECT, INFORMATION_SCHEMA, or wp_users queries in MySQL slow or general query logs correlated with plugin URIs
Spikes in 500-level HTTP responses from the plugin endpoint, often indicating payload tuning by an attacker
Outbound traffic from the web server to unknown hosts shortly after suspicious plugin requests

Detection Strategies

Enable WordPress debug logging and MySQL query logging to capture queries originating from the plugin
Deploy a Web Application Firewall ruleset tuned to SQL injection patterns on plugin query parameters
Correlate web server access logs with database query logs to identify payloads reaching the vulnerable function
Hunt for new or modified administrator accounts and unexpected password hash changes in wp_users

Monitoring Recommendations

Monitor plugin version inventory across managed WordPress sites to flag installations below version 4.2.19
Alert on anomalous read volumes against the WordPress database from the web application process
Track HTTP request rates per source IP against the plugin endpoint for brute SQL enumeration behavior

How to Mitigate CVE-2026-87781

Immediate Actions Required

Upgrade the LTL Freight Quotes plugin to version 4.2.19 or later on all WordPress instances
Rotate WordPress administrator passwords and secret keys defined in wp-config.php if exploitation is suspected
Review wp_users and wp_usermeta tables for unauthorized accounts or privilege changes
Audit recent database backups to establish a known-good baseline for comparison

Patch Information

The vendor addressed the issue in LTL Freight Quotes plugin version 4.2.19. Administrators should apply the update through the WordPress plugin administration page or via WP-CLI. Confirmation details and the technical write-up are available in the WPScan Vulnerability Report.

Workarounds

Deactivate the LTL Freight Quotes plugin until the patched version can be installed
Restrict access to the plugin's endpoints with WAF rules blocking SQL metacharacters in the affected parameter
Apply least-privilege to the MySQL account used by WordPress to limit the blast radius of a successful injection

bash

# Update the plugin using WP-CLI
wp plugin update eniture-technology-ltl-freight-quotes --version=4.2.19

# Verify the installed version
wp plugin get eniture-technology-ltl-freight-quotes --field=version