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CVE-2026-57683 – Unauthenticated SQL Injection – WP Fast Total Search WordPress Plugin <= 1.80.280

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Summary

CVE-2026-57683 is a critical unauthenticated SQL injection vulnerability in the WP Fast Total Search WordPress plugin (by Epsiloncool), affecting all versions up to and including 1.80.280. With a CVSS v3.1 score of 9.3, the flaw allows remote, unauthenticated attackers to inject arbitrary SQL commands and extract sensitive data from the WordPress database. A patched version (1.81.282) has been released and immediate upgrade is strongly recommended.

Technical details

  • Root cause: Insufficient sanitization and improper preparation of SQL queries within the plugin’s search processing logic (CWE-89: SQL Injection).
  • Attack pattern: Blind SQL Injection (CAPEC-7) — an attacker sends specially crafted HTTP requests to the vulnerable plugin endpoint without any authentication or user interaction.
  • Attack vector: Network-accessible; no credentials, no prior access, and no victim interaction are required (AV:N/AC:L/PR:N/UI:N).
  • Impact: Confidentiality impact is rated High with Scope Changed, meaning successful exploitation allows extraction of data from the full WordPress database — potentially including user credentials, personal data, API keys, and other secrets stored across all database tables. Availability impact is rated Low, indicating a possible ancillary effect on service performance.

Affected software

  • WP Fast Total Search (plugin slug: fulltext-search) by Epsiloncool — all versions <= 1.80.280

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector String: 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 WP Fast Total Search plugin to version 1.81.282 or later. The plugin’s official changelog explicitly marks this release as an "IMPORTANT SECURITY FIX" for the SQL injection vulnerability.
  • If immediate patching is not feasible: Restrict public access to the WordPress installation at the network or WAF level until the plugin can be updated. Consider temporarily deactivating the plugin to remove the vulnerable attack surface.

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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