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CVE-2026-57739 – Blind SQL Injection – AcyMailing SMTP Newsletter WordPress Plugin ≤ 10.11.0

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Summary

CVE-2026-57739 is a critical Blind SQL Injection vulnerability (CWE-89) in the AcyMailing SMTP Newsletter plugin for WordPress, affecting all versions through 10.11.0. With a CVSS v3.1 base score of 9.3, the flaw can be triggered remotely by an unauthenticated attacker over the network with no user interaction required, enabling exfiltration of sensitive data from the underlying WordPress database.

Technical details

  • Root cause: Improper neutralization of special elements in SQL commands — user-supplied input is not sufficiently sanitized or escaped before being incorporated into database queries, enabling blind (inferential) SQL injection.
  • Trigger conditions: No authentication, no elevated privileges, and no user interaction are required. The attack can be executed directly over HTTP/HTTPS by any internet-accessible attacker.
  • Attack vector: Remote, unauthenticated, network-based (AV:N/AC:L/PR:N/UI:N). Low attack complexity means no special conditions or race conditions must be met.
  • Impact: Scope is changed (S:C), meaning the vulnerability’s effects extend beyond the plugin’s own component to the broader WordPress database. Confidentiality impact is rated High (C:H), allowing an attacker to extract sensitive database contents such as user credentials, email subscriber lists, and site configuration data. Availability impact is rated Low (A:L). Integrity is not directly affected (I:N).

Affected software

  • AcyMailing SMTP Newsletter (WordPress plugin) — all versions from inception through 10.11.0 (inclusive)
  • Version 10.11.1 and later are not affected

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 action — patch now: Update the AcyMailing SMTP Newsletter plugin to version 10.11.1 or later. This version, released July 9, 2026, contains the vendor’s fix for this SQL injection vulnerability. The vendor’s official changelog explicitly states: "A vulnerability allowing SQL injection has been patched. Updating is strongly recommended."
  • If immediate patching is not possible: Restrict network access to the WordPress instance at the perimeter/WAF level to trusted IP ranges only, and closely monitor database query logs for anomalous or time-delayed SQL activity indicative of blind injection attempts.
  • The plugin has 7,000+ active installations on WordPress.org, making the potential attack surface broad. All sites running AcyMailing should treat this as an urgent update.

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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