CVE-2026-73388: Nikstore Core SQL Injection Vulnerability

CVE-2026-73388 Overview

CVE-2026-73388 is an unauthenticated SQL injection vulnerability affecting the Nikstore Core WordPress plugin in versions up to and including 1.5. The flaw allows remote attackers to inject arbitrary SQL statements into backend database queries without any authentication or user interaction. Because the plugin fails to properly sanitize user-supplied input before passing it to SQL queries, adversaries can manipulate query logic to extract data or influence application state. The vulnerability is tracked under CWE-89 and documented in the Patchstack WordPress Vulnerability Report.

Critical Impact
Remote, unauthenticated attackers can inject SQL statements against WordPress sites running Nikstore Core <= 1.5, enabling database compromise and cross-scope impact.

Affected Products

Nikstore Core WordPress plugin versions <= 1.5
WordPress sites with the Nikstore Core plugin installed and active
Any downstream e-commerce deployments bundling the vulnerable plugin

Discovery Timeline

2026-08-19 - CVE-2026-73388 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-73388

Vulnerability Analysis

The vulnerability is a classic SQL injection issue rooted in improper neutralization of special characters within SQL statements. The Nikstore Core plugin accepts attacker-controlled input through an HTTP request parameter and concatenates that input directly into a database query without prepared statements or adequate sanitization. Because the affected code path does not enforce authentication, any unauthenticated remote client on the network can trigger the flaw.

Exploitation targets the database backend that WordPress uses, typically MySQL or MariaDB. A successful injection allows extraction of records, inference of schema, and influence over query results returned by the plugin. The attack vector is network-based with low complexity and no privileges or user interaction required, which broadens the pool of viable attackers to any actor able to reach the WordPress site.

Root Cause

The root cause is missing input validation and unsafe query construction in the plugin's request-handling logic. Input from HTTP parameters is used to build SQL statements dynamically rather than being bound as parameters through prepared statements. This corresponds to CWE-89: Improper Neutralization of Special Elements used in an SQL Command.

Attack Vector

An attacker sends a crafted HTTP request to the WordPress endpoint exposed by the Nikstore Core plugin. The malicious payload embeds SQL metacharacters and clauses inside a parameter that the plugin passes to the database. See the Patchstack advisory for technical details on the affected parameter and endpoint.

Detection Methods for CVE-2026-73388

Indicators of Compromise

HTTP requests to Nikstore Core plugin endpoints containing SQL metacharacters such as ', --, UNION SELECT, SLEEP(, or information_schema
Web server access logs showing anomalous query strings targeting plugin URLs under /wp-content/plugins/nikstore-core/
Unexpected database errors or long-running queries originating from WordPress worker processes

Detection Strategies

Inspect WordPress and web server logs for parameter values that include encoded SQL syntax or boolean/time-based injection patterns
Alert on outbound database queries from WordPress that reference information_schema, wp_users, or wp_usermeta from plugin code paths
Correlate spikes in 500 responses or database latency from the WordPress host with inbound requests to the Nikstore Core plugin

Monitoring Recommendations

Enable WordPress debug logging and forward web, application, and database logs to a central analytics platform
Deploy a web application firewall (WAF) with SQL injection signatures tuned for WordPress plugin traffic
Monitor the plugin directory for unexpected file modifications following suspicious request activity

How to Mitigate CVE-2026-73388

Immediate Actions Required

Identify all WordPress instances running Nikstore Core and confirm the installed version
Deactivate and remove the plugin on any site running version <= 1.5 until a fixed release is applied
Rotate WordPress administrator passwords and API keys that may have been exposed via database access
Review database audit logs for evidence of unauthorized SELECT activity against sensitive tables

Patch Information

Refer to the Patchstack WordPress Vulnerability Report for the latest guidance on a patched version. Upgrade Nikstore Core to a release later than 1.5 once the vendor publishes a fix.

Workarounds

Block requests to Nikstore Core plugin endpoints at the WAF or reverse proxy until a patched version is deployed
Restrict access to the WordPress site by IP allowlist where feasible to reduce exposure
Apply virtual patching rules that reject requests containing SQL injection payloads targeting the plugin

bash

# Example WAF rule (ModSecurity) blocking SQLi patterns on the plugin path
SecRule REQUEST_URI "@contains /wp-content/plugins/nikstore-core/" \
  "phase:2,deny,status:403,id:1732026,\
   chain,msg:'Block potential SQLi against Nikstore Core (CVE-2026-73388)'"
  SecRule ARGS "@rx (?i)(union(\s|\+)+select|information_schema|sleep\(|--|';)" "t:none"