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Vulnerability record · public intelligence
CVE-2026-104082
HIGH

SmarterMail < Build 9777 SysAdmin Remote Code Execution via Volume Mount

Published Oct 9, 2026 · Updated Nov 3, 2026

Severity · CVSSHIGH · Not scored
Known exploitationNot listed
EPSS / likelihood0.87%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

SmarterMail < Build 9777 SysAdmin Remote Code Execution via Volume Mount

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

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.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. Release Notes ↗
  2. Researcher Blog ↗
  3. VulnCheck Advisory: SmarterMail < Build 9777 SysAdmin Remote Code Execution via Volume Mount ↗

Record history

Published Oct 9, 2026 · Last refreshed Nov 3, 2026

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