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CVE-2026-66593 – Unauthenticated SQL Injection – Security & Malware scan by CleanTalk WordPress Plug

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Summary

CVE-2026-66593 is an unauthenticated SQL injection vulnerability in the "Security & Malware scan by CleanTalk" WordPress plugin, affecting versions up to and including 2.184. The flaw allows a remote, unauthenticated attacker to inject SQL statements and interact directly with the site’s database. It carries a CVSS v3.1 base score of 9.3 (Critical).

Technical details

  • Root cause: improper neutralization of user-supplied input before it is used in a SQL query (SQL Injection).
  • Trigger conditions: no authentication is required to reach the vulnerable code path.
  • Attack vector: network — exploitable remotely over HTTP(S) against any internet-exposed WordPress site running the vulnerable plugin version.
  • Impact: unauthorized read access to database contents (e.g., credentials, user data); the CVSS vector indicates a scope change with high confidentiality impact and low availability impact, and no integrity impact.

Affected software

  • Security & Malware scan by CleanTalk (WordPress plugin, package security-malware-firewall) — versions up to and including 2.184.

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: Update the Security & Malware scan by CleanTalk plugin to version 2.185 or later.
  • If patching cannot be performed immediately: consider disabling/deactivating the plugin until the update can be applied, and monitor web server/database logs for anomalous SQL error patterns or unexpected query behavior.

References

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