SmarterTools SmarterMail File Edit API Directory Traversal Remote Code Execution Vulnerability

November 13th, 2026
ZDI-26-994 ZDI-CAN-30742

CVE ID

CVE-2026-126967

CVSS Score

8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

SmarterTools

Affected Products

SmarterMail

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of SmarterTools SmarterMail. Authentication is required to exploit this vulnerability.

The specific flaw exists within the FileStorageController class. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.

Additional Details

Fixed in SmarterMail Build 9735


Disclosure Timeline

  • 2026-08-20 - Vulnerability reported to vendor
  • 2026-11-13 - Coordinated public release of advisory
  • 2026-11-13 - Advisory Updated

Credit

Shaber Tseng

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