---
id: CVE-2026-104082
title: >-
  SmarterMail before build 9777 contains a remote code execution vulnerability
  that allows an attacker holding a SysAdmin-scoped access token to bypass the
  Volume Mount script-directory containment control by provisioning a new mail
  domain…
summary: >-
  SmarterMail before build 9777 contains a remote code execution vulnerability
  that allows an attacker holding a SysAdmin-scoped access token to bypass the
  Volume Mount script-directory containment control by provisioning a new mail
  domain…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T17:06:17.770'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104082'
references:
  - url: >-
      https://www.smartertools.com/smartermail/release-notes/current#/9526:~:text=Build%209777%20(Oct%208%2C%202026)
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/smartermail-build-9777-sysadmin-remote-code-execution-via-volume-mount
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-09T17:04:42.806Z'
---

## Overview

SmarterMail before build 9777 contains a remote code execution vulnerability that allows an attacker holding a SysAdmin-scoped access token to bypass the Volume Mount script-directory containment control by provisioning a new mail domain with an arbitrary FileStore root path inside the trusted Scripts directory via the domain-put endpoint. Attackers can disclose the Scripts path through the AddOrUpdateMount endpoint, clear the upload extension blacklist via the global-mail endpoint, then upload a malicious script through the ordinary mail file-storage upload API so that saving a CommandMount triggers RunScript before validation, resulting in a reverse shell executing as the SmarterMail service account with SYSTEM-level privileges.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.