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CVE-2026-95588 – Unauthenticated Arbitrary File Deletion – WordPress AcyMailing SMTP Newsletter ≤ 11

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Summary

CVE-2026-95588 is an unauthenticated arbitrary file deletion vulnerability in the AcyMailing SMTP Newsletter plugin for WordPress, affecting all versions up to and including 11.0.5. The flaw stems from a path traversal weakness (CWE-22) that lets an attacker delete arbitrary files on the server without authenticating, and it carries a CVSS v3.1 base score of 8.6 (High).

Technical details

  • Root cause: The plugin fails to properly sanitize or restrict file paths used during file deletion operations, allowing path traversal sequences (e.g., ../) to escape the intended upload/storage directory.
  • Trigger conditions: No authentication, privileges, or user interaction are required to exploit the issue; an attacker simply sends crafted requests to the vulnerable deletion routine.
  • Attack vector: Network-based (remotely exploitable over HTTP/HTTPS against any internet-facing WordPress site running the affected plugin).
  • Impact: Successful exploitation results in deletion of arbitrary files on the hosting server. This can be used to remove critical WordPress files, leading to site outages, denial of service, or conditions that facilitate further compromise (e.g., forcing reconfiguration workflows).

Affected software

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

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Mitigation and recommended actions

  • Immediate: Upgrade AcyMailing SMTP Newsletter to version 11.1.0 or later, which remediates the path traversal/file deletion issue.
  • If immediate patching is not possible: Restrict or disable public-facing functionality that interacts with file handling in the plugin, monitor web server and WordPress logs for unexpected file deletions or path traversal patterns (e.g., ../ sequences) in requests, and ensure regular, tested backups of the WordPress installation are maintained so critical files can be restored if deleted.
  • Do not delay patching due to the lack of required authentication or user interaction — this combination significantly increases exploitability from the internet.

References

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