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CVE-2026-73388 – Unauthenticated SQL Injection – Nikstore Core WordPress Plugin (<= 1.5)

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Summary

CVE-2026-73388 is a critical unauthenticated SQL Injection vulnerability (CWE-89) affecting the Nikstore Core WordPress plugin, developed by TeconceTheme. The flaw allows a remote, unauthenticated attacker to inject malicious SQL through the plugin’s improper neutralization of special elements used in SQL commands. The vulnerability carries a CVSS v3.1 base score of 9.3 (Critical).

Technical details

  • Root cause: Improper neutralization of special elements used in an SQL command (CWE-89) within the Nikstore Core plugin’s code.
  • Trigger conditions: No authentication or user interaction is required to exploit the flaw.
  • Attack vector: Network — exploitable remotely over HTTP(S) against any internet-exposed WordPress site running the vulnerable plugin.
  • Impact: Successful exploitation can allow an attacker to read sensitive data from the site’s database (high confidentiality impact) and can degrade availability of the affected system.

Affected software

  • Nikstore Core (WordPress plugin) versions up to and including 1.5

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Mitigation and recommended actions

  • Immediate: Upgrade Nikstore Core to a version newer than 1.5 as soon as the vendor releases a patched build; verify the installed version via the WordPress plugin dashboard.
  • If no patch is yet available: Disable or remove the Nikstore Core plugin from any internet-facing WordPress installation until a fix is confirmed available.
  • Network mitigations: Restrict or monitor access to the affected site’s WordPress endpoints, deploy a web application firewall (WAF) with SQL injection detection rules, and review database and web server logs for anomalous query patterns indicative of exploitation attempts.

References

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