SmarterTools SmarterMail up to 9560 Volume Mount script-directory containment control code injection

Summaryinfo

A vulnerability classified as critical has been found in SmarterTools SmarterMail. The impacted element is an unknown function of the component Volume Mount script-directory containment control. This manipulation causes code injection. The identification of this vulnerability is CVE-2026-104082. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in SmarterTools SmarterMail and classified as critical. Affected by this vulnerability is some unknown processing of the component Volume Mount script-directory containment control. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at smartertools.com. This vulnerability is known as CVE-2026-104082 since 10/01/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 9777 eliminates this vulnerability.

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Productinfo

Vendor

• SmarterTools

Name

• SmarterMail

Version

• 1.6.1511
• 1.6.1529
• 4.3
• 5.0.2999
• 7.1.3876
• 9.2
• 13.3.5535
• 16.x Build 8747
• 100.0.7803
• 100.0.9511
• 100.0.9518
• 100.0.9610
• 7776
• 9526
• 9560

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CPE 2.2info

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