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CVE-2026-81756 – Unauthenticated SQL Injection – Smart Marketing SMS and Newsletters Forms (WordPres

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Summary

CVE-2026-81756 is a critical, unauthenticated SQL Injection vulnerability (CWE-89) affecting the Smart Marketing SMS and Newsletters Forms WordPress plugin, developed by Autorius/E-goi. The flaw allows remote attackers to inject and execute SQL statements without any authentication or user interaction, and it carries a CVSS v3.1 base score of 9.3 (Critical).

Technical details

  • Root cause: the plugin fails to properly neutralize special elements in user-supplied input before incorporating it into SQL queries, enabling SQL injection.
  • Attack type: exploitable as a blind SQL injection (CAPEC-7), meaning attackers can infer database contents through indirect responses rather than direct query output.
  • Trigger conditions: no authentication or privileges are required, and no user interaction is needed to exploit the vulnerable functionality.
  • Attack vector: network-based, exploitable remotely over HTTP(S) against any internet-facing WordPress site running the vulnerable plugin.
  • Impact: high confidentiality impact (unauthorized read access to database contents, e.g., subscriber/user data) and low availability impact, with scope changed (S:C) per the CVSS vector.

Affected software

  • Smart Marketing SMS and Newsletters Forms (WordPress plugin, slug smart-marketing-for-wp) — all versions up to and including 5.1.24.
  • Fixed in version 5.1.25 and later.

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 Smart Marketing SMS and Newsletters Forms plugin to version 5.1.25 or later.
  • If immediate patching is not possible: disable or deactivate the plugin until it can be updated, restrict access to the affected site’s public-facing forms, and monitor web server/database logs for anomalous query patterns indicative of SQL injection attempts.
  • General hardening: apply a web application firewall (WAF) rule set capable of detecting SQL injection payloads as a compensating control while patching is completed.

References

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