CVE-2026-54819: Listdom Blind SQL Injection Vulnerability

CVE-2026-54819 Overview

CVE-2026-54819 is a blind SQL injection vulnerability in the Webilia Inc. Listdom WordPress plugin. The flaw stems from improper neutralization of special elements used in SQL commands [CWE-89]. It affects all Listdom versions from initial release through 5.4.0. An unauthenticated attacker can inject SQL statements over the network without user interaction. Successful exploitation can expose sensitive database contents and impact application availability. The issue is tracked under the Patchstack vulnerability database and carries a critical severity rating.

Critical Impact
Unauthenticated remote attackers can execute blind SQL injection against WordPress sites running Listdom 5.4.0 or earlier, exposing confidential database records.

Affected Products

Webilia Inc. Listdom WordPress plugin versions up to and including 5.4.0
WordPress sites with Listdom installed and activated
Any deployment exposing the plugin's vulnerable endpoints to the internet

Discovery Timeline

2026-06-17 - CVE CVE-2026-54819 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-54819

Vulnerability Analysis

The vulnerability resides in Listdom's handling of user-supplied input incorporated into SQL queries. User input is concatenated into database queries without proper parameterization or sanitization. The flaw is classified as blind SQL injection, meaning the application does not return query results directly. Attackers infer database content through boolean or time-based response differences. The attack vector is network-based with low complexity. No authentication or user interaction is required, which broadens the exploitable population significantly. The scope is changed, indicating impact can extend beyond the vulnerable component to other parts of the WordPress installation or database.

Root Cause

The root cause is improper neutralization of special elements in SQL commands [CWE-89]. Listdom builds SQL statements by interpolating request parameters directly into query strings. The plugin does not use prepared statements or the WordPress $wpdb->prepare() API consistently for all dynamic inputs. As a result, attacker-controlled SQL operators and conditions are interpreted by the database engine.

Attack Vector

An unauthenticated attacker sends crafted HTTP requests to Listdom plugin endpoints with malicious SQL payloads in parameters. Because the injection is blind, attackers typically use boolean-based or time-based payloads such as AND SLEEP(5) or conditional CASE WHEN clauses. Repeated requests allow extraction of arbitrary data including WordPress user credentials, password hashes, and session tokens from the wp_users and wp_options tables. The Patchstack advisory documents the affected parameter and endpoint. See the Patchstack Security Vulnerability advisory for technical details.

Detection Methods for CVE-2026-54819

Indicators of Compromise

HTTP requests to Listdom plugin endpoints containing SQL keywords such as UNION, SELECT, SLEEP, BENCHMARK, or CASE WHEN in query parameters
Anomalous spikes in response latency consistent with time-based blind injection probes
Repeated requests to the same Listdom endpoint with incrementally varied parameter values from a single source IP
Unexpected outbound database queries or new administrative WordPress accounts created without audit trail

Detection Strategies

Inspect web server access logs for Listdom URLs containing URL-encoded SQL metacharacters such as %27, %20OR%20, or --
Deploy a Web Application Firewall (WAF) rule set tuned for WordPress SQL injection patterns targeting plugin parameters
Enable MySQL or MariaDB general query logging on staging environments to identify malformed or unparameterized queries originating from the plugin

Monitoring Recommendations

Alert on HTTP 500 responses from Listdom endpoints, which often indicate failed injection attempts
Monitor for sudden growth in wp_users table entries or modifications to the wp_optionssiteurl and home values
Forward WordPress and web server telemetry to a centralized SIEM for correlation across multiple sites

How to Mitigate CVE-2026-54819

Immediate Actions Required

Upgrade the Listdom plugin to a version later than 5.4.0 as soon as the vendor publishes a fixed release
Restrict access to Listdom administrative and AJAX endpoints to known IP ranges where feasible
Audit WordPress user accounts, API keys, and database integrity for signs of prior exploitation
Rotate WordPress administrator credentials and database passwords if exploitation is suspected

Patch Information

Refer to the Patchstack Security Vulnerability advisory for the fixed version and patch details from Webilia Inc. Apply the vendor-supplied update through the WordPress plugin manager or via WP-CLI.

Workarounds

Deactivate and remove the Listdom plugin until a patched version is available and tested
Deploy WAF virtual patching rules that block requests containing SQL injection signatures against Listdom endpoints
Apply Patchstack's mitigation feed to WordPress sites that cannot be patched immediately

bash

# Configuration example: update Listdom via WP-CLI once a patched release is available
wp plugin update listdom --version=<patched-version>
wp plugin list --name=listdom --fields=name,status,version