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CVE-2026-56067 – Unauthenticated SQL Injection – JetSmartFilters WordPress Plugin <= 3.8.3

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Summary

CVE-2026-56067 is a critical unauthenticated SQL Injection vulnerability in the JetSmartFilters WordPress plugin (by Crocoblock/Jetimpex Inc.), affecting all versions up to and including 3.8.3. The flaw requires no credentials or user interaction to exploit, allowing any remote attacker to interact directly with the underlying WordPress database. It carries a CVSS v3.1 base score of 9.3 (Critical) and was publicly disclosed on June 26, 2026.

Technical details

  • Root cause: Improper neutralization of special elements used in SQL commands (CWE-89) — the plugin fails to adequately sanitize and escape user-supplied input before incorporating it into database queries, enabling injection of arbitrary SQL statements.
  • Trigger conditions: No authentication or user interaction is required. A specially crafted HTTP request to an affected plugin endpoint is sufficient to trigger the injection.
  • Attack vector: Fully remote (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N) — the lowest possible barrier to exploitation.
  • Impact: The Scope:Changed (S:C) rating indicates the impact extends beyond the plugin component itself into the broader WordPress database. With Confidentiality:High (C:H), attackers can extract sensitive database contents including WordPress user credentials, session tokens, API keys, and any personally identifiable information (PII) stored in the database. Availability is also partially impacted (A:L). No integrity impact (I:N) has been assessed.

Affected software

  • JetSmartFilters WordPress Plugin by Crocoblock/Jetimpex Inc., all versions up to and including 3.8.3

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 JetSmartFilters plugin to version 3.8.3.1 or later, which contains the vendor-released fix. This update is available through the standard WordPress plugin update mechanism.
  • If immediate patching is not feasible: Temporarily deactivate the JetSmartFilters plugin to eliminate the attack surface, and apply web application firewall (WAF) rules to block SQL injection payloads targeting the affected endpoints until the patch can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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