CVE-2026-48875: JetSmartFilters SQLi Vulnerability

CVE-2026-48875 Overview

CVE-2026-48875 is an unauthenticated SQL Injection vulnerability affecting the JetSmartFilters WordPress plugin in versions <= 3.8.1. The flaw is classified under [CWE-89] (Improper Neutralization of Special Elements used in an SQL Command). Attackers can exploit the vulnerability over the network without authentication or user interaction. Successful exploitation allows manipulation of backend SQL queries, exposing database contents and potentially impacting downstream components beyond the vulnerable plugin scope.

Critical Impact
Remote attackers can inject arbitrary SQL queries against WordPress sites running JetSmartFilters <= 3.8.1 without authentication, leading to confidentiality loss and partial availability impact across connected systems.

Affected Products

JetSmartFilters WordPress plugin versions <= 3.8.1
WordPress sites using JetSmartFilters for product or post filtering
Sites bundling JetSmartFilters via Crocoblock JetPlugins suites

Discovery Timeline

2026-06-17 - CVE-2026-48875 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-48875

Vulnerability Analysis

The vulnerability is a SQL Injection flaw [CWE-89] in the JetSmartFilters plugin. User-controlled input reaches a SQL query construction routine without proper sanitization or parameterization. Because the plugin exposes filter endpoints to anonymous visitors, attackers do not need credentials or social engineering to deliver a payload.

The attack surface is network reachable and exploitation complexity is low. The scope is marked as changed, meaning a successful injection may affect resources beyond the plugin's security boundary, such as other tables or data owned by separate WordPress components sharing the same database.

Confidentiality impact is high because attackers can read arbitrary database rows, including wp_users password hashes and session tokens. Availability impact is low, reflecting that injection payloads can degrade query performance or trigger errors. Integrity is not directly affected by this particular injection path according to the vector.

Root Cause

The root cause is improper neutralization of special characters in SQL statements. JetSmartFilters concatenates request parameters into queries that are dispatched to wpdb without using $wpdb->prepare() placeholders or strict input validation. Filter-related parameters serve as injection entry points.

Attack Vector

An unauthenticated remote attacker sends a crafted HTTP request to a JetSmartFilters endpoint exposed by the target WordPress site. The malicious parameter contains SQL syntax that breaks out of the intended query context. The injected statement executes in the database, returning data to the attacker through error messages, UNION-based extraction, or time-based inference.

No verified public exploit code is currently available. Technical details are documented in the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-48875

Indicators of Compromise

HTTP requests to JetSmartFilters AJAX endpoints containing SQL keywords such as UNION, SELECT, SLEEP(, BENCHMARK(, or INFORMATION_SCHEMA
Anomalous query latency or repeated wpdb errors logged by WordPress debug logging
Outbound database error responses returned to anonymous clients via the WordPress REST API
Spikes in unauthenticated requests to filter parameters from a single IP or distributed sources

Detection Strategies

Inspect web server access logs for requests containing encoded SQL metacharacters (%27, %22, --, %23) targeting JetSmartFilters routes
Enable Web Application Firewall (WAF) rules that flag SQLi patterns against /wp-admin/admin-ajax.php actions related to jet_smart_filters
Monitor wp_options and user tables for unexpected reads via MySQL general or audit logs

Monitoring Recommendations

Forward WordPress, PHP, and MySQL logs to a centralized SIEM for correlation across the request and query layers
Alert on bursts of HTTP 500 responses from JetSmartFilters endpoints that suggest failed injection attempts
Track plugin version inventory across hosted WordPress sites to identify systems still running <= 3.8.1

How to Mitigate CVE-2026-48875

Immediate Actions Required

Identify all WordPress sites running JetSmartFilters and confirm the installed version using the WordPress plugin manager
Update JetSmartFilters to a version newer than 3.8.1 as soon as the vendor publishes a fixed release
Restrict access to JetSmartFilters AJAX endpoints behind a WAF until patching is complete
Rotate database credentials and WordPress administrator passwords if exploitation is suspected

Patch Information

Refer to the Patchstack Vulnerability Report for the authoritative patch status and remediation guidance from Crocoblock. Apply the fixed plugin release through the WordPress administrative dashboard once available.

Workarounds

Deploy WAF rules that block requests containing SQL injection signatures targeting JetSmartFilters parameters
Temporarily deactivate the JetSmartFilters plugin on production sites where filtering is not business critical
Apply principle of least privilege to the MySQL user configured in wp-config.php to limit database exposure during exploitation

bash

# Example: list and update the vulnerable plugin using WP-CLI
wp plugin list --name=jet-smart-filters --fields=name,status,version
wp plugin update jet-smart-filters