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CVE-2026-82082 – Unauthenticated OS Command Injection / RCE – NUMail (All Versions)

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Summary

CVE-2026-82082 is a critical OS command injection vulnerability in NUMail, an email/webmail product developed by Green-Computing. The flaw allows unauthenticated remote attackers to inject and execute arbitrary operating system commands on the underlying server, with no authentication or user interaction required. The vulnerability is rated Critical severity.

Technical details

  • Root cause: Improper neutralization of special elements used in OS commands (CWE-78) within NUMail’s server-side processing.
  • Trigger conditions: A remote attacker sends a crafted request to a vulnerable NUMail instance; no valid credentials or user interaction are needed.
  • Attack vector: Network — the vulnerability is remotely exploitable over the network.
  • Impact: Successful exploitation results in arbitrary OS command execution on the host server, which can lead to full compromise of confidentiality, integrity, and availability of the affected system.

Affected software

  • NUMail — all versions prior to 202602162 (Green-Computing).

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade NUMail to version 202602162 or later, which resolves the OS command injection flaw.
  • If immediate patching is not possible: Restrict network access to the NUMail service to trusted networks only, place the application behind a web application firewall configured to block command-injection patterns, and monitor server logs for anomalous command execution or unexpected outbound connections until the patch can be applied.

References

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