CVE-2026-39438: ListingPro SQL Injection Vulnerability

CVE-2026-39438 Overview

CVE-2026-39438 is an unauthenticated SQL injection vulnerability affecting the ListingPro WordPress plugin in versions 2.9.10 and earlier. The flaw maps to [CWE-89] (Improper Neutralization of Special Elements used in an SQL Command) and carries a CVSS 3.1 base score of 9.3. Remote attackers can send crafted requests over the network without authentication or user interaction. Successful exploitation allows confidentiality impact across a scope-changed boundary, exposing database contents that may include WordPress user records, password hashes, and plugin-managed listing data.

Critical Impact
Unauthenticated attackers can extract sensitive data from the WordPress database of any site running ListingPro <= 2.9.10, with no privileges or user interaction required.

Affected Products

ListingPro WordPress plugin versions <= 2.9.10
WordPress sites using the ListingPro directory/listing plugin
Hosting environments exposing vulnerable ListingPro endpoints to the public internet

Discovery Timeline

2026-06-17 - CVE-2026-39438 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-39438

Vulnerability Analysis

The vulnerability is an unauthenticated SQL injection in the ListingPro plugin. An attacker can supply malicious SQL fragments through a parameter that the plugin concatenates into a database query without proper sanitization or parameterization. Because the affected endpoint is reachable without authentication, exploitation requires only network access to the target WordPress site.

The CVSS vector indicates a scope change, meaning the injected SQL can reach data beyond the vulnerable plugin's immediate context — typically the full WordPress database, including the wp_users and wp_usermeta tables. The impact profile prioritizes confidentiality (High) with limited availability impact, which is consistent with read-oriented SQL injection that can also issue heavy queries against the database.

The EPSS score at publication is 0.372%, placing exploitation probability in the 28.9th percentile. No public proof-of-concept or in-the-wild exploitation has been confirmed at the time of disclosure.

Root Cause

The root cause is improper neutralization of user-supplied input within an SQL query construction path inside ListingPro. The plugin builds queries by interpolating request parameters directly into SQL statements rather than using prepared statements or the $wpdb->prepare() API provided by WordPress. As a result, attacker-controlled characters such as quotes, UNION, and SELECT are interpreted by the database engine instead of being treated as data.

Attack Vector

The attack vector is network-based and unauthenticated. An attacker issues HTTP requests to the vulnerable ListingPro endpoint with crafted query string or POST parameters containing SQL payloads. Typical exploitation patterns for this class of flaw include UNION-based extraction of user_login and user_pass values from wp_users, boolean-based blind enumeration, and time-based blind injection using SLEEP(). For technical specifics, see the Patchstack SQL Injection Vulnerability Report.

Detection Methods for CVE-2026-39438

Indicators of Compromise

HTTP requests to ListingPro endpoints containing SQL meta-characters such as ', ", --, UNION SELECT, INFORMATION_SCHEMA, or SLEEP(
Unusual outbound database query latency or wpdb errors logged in debug.log referencing ListingPro handlers
Web server access logs showing repeated requests from a single source with incrementing payload lengths characteristic of blind SQLi enumeration
New or unexpected administrator accounts created in wp_users shortly after suspicious request bursts

Detection Strategies

Deploy WAF rules that inspect query string and POST parameters targeting ListingPro routes for SQL injection signatures
Enable MySQL/MariaDB general or slow query logging and alert on queries containing UNION SELECT or unusual WHERE clauses originating from PHP-FPM processes serving the plugin
Correlate HTTP request anomalies with database error responses to identify in-progress exploitation attempts

Monitoring Recommendations

Monitor authentication events for unexpected logins or password resets following suspicious HTTP traffic to ListingPro endpoints
Forward web server, PHP error, and database logs to a centralized SIEM for correlation and retention
Baseline normal request patterns to ListingPro URLs and alert on parameter values exceeding expected length or character sets

How to Mitigate CVE-2026-39438

Immediate Actions Required

Identify all WordPress sites running ListingPro and confirm the installed version against 2.9.10
Update ListingPro to the latest patched release published by the vendor as referenced in the Patchstack advisory
Rotate WordPress administrator passwords, secret keys in wp-config.php, and any API tokens stored in the database
Review wp_users and wp_usermeta for unauthorized accounts or role changes

Patch Information

The vendor has addressed the vulnerability in a version released after 2.9.10. Apply the latest plugin update through the WordPress plugin dashboard or via WP-CLI. Refer to the Patchstack SQL Injection Vulnerability Report for the fixed version reference and remediation guidance.

Workarounds

Deploy a web application firewall with virtual patching rules blocking SQL injection payloads to ListingPro endpoints until the plugin can be updated
Restrict access to the WordPress site by IP allow-list at the edge if the listing directory is not required for public use
Temporarily deactivate the ListingPro plugin if the patched version cannot be applied promptly

bash

# Update ListingPro using WP-CLI once the patched version is available
wp plugin update listingpro-plugin --path=/var/www/html

# Verify the installed version
wp plugin get listingpro-plugin --field=version --path=/var/www/html