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CVE-2026-94389 – Unauthenticated RCE – WordPress AcyMailing SMTP Newsletter ≤ 11.0.5

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Summary

CVE-2026-94389 is a critical, unauthenticated remote code execution vulnerability in the AcyMailing SMTP Newsletter plugin for WordPress. It is classified under CWE-94 (Improper Control of Generation of Code / Code Injection) and affects all plugin versions up to and including 11.0.5. The flaw carries a CVSS v3.1 base score of 9.0 (Critical) and does not require authentication or user interaction to exploit.

Technical details

  • Root cause: Improper control of code generation (CWE-94) within the AcyMailing SMTP Newsletter plugin allows injected code to be executed by the server.
  • Trigger conditions: The scoring reflects high attack complexity (AC:H), indicating exploitation depends on specific conditions or configuration state rather than a single trivial request.
  • Attack vector: Network-based (AV:N); no privileges (PR:N) and no user interaction (UI:N) are required to attempt exploitation.
  • Scope and impact: The CVSS vector reflects a changed scope (S:C) with high impact to confidentiality, integrity, and availability (C:H/I:H/A:H), consistent with arbitrary code execution on the affected WordPress site.

Affected software

  • AcyMailing SMTP Newsletter (WordPress plugin) by AcyMailing Newsletter Team — all versions up to and including 11.0.5
  • Fixed in version 11.1.0 and later

Severity

  • CVSS v3.1 Base Score: 9.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the AcyMailing SMTP Newsletter WordPress plugin to version 11.1.0 or later.
  • If immediate patching is not possible: Restrict or monitor access to the WordPress admin and plugin-facing endpoints, and review site logs for unexpected code execution or unauthorized file changes until the update can be applied.
  • Do not downgrade to a pre-11.1.0 release to work around unrelated compatibility issues, as doing so would reintroduce this vulnerability.

References

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