CVE-2026-25067
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
2Tags
Description
SmarterTools SmarterMail versions prior to build 9518 contain an unauthenticated path coercion vulnerability in the background-of-the-day preview endpoint. The application base64-decodes attacker-supplied input and uses it as a filesystem path without validation. On Windows systems, this allows UNC paths to be resolved, causing the SmarterMail service to initiate outbound SMB authentication attempts to attacker-controlled hosts. This can be abused for credential coercion, NTLM relay attacks, and unauthorized network authentication.
Analysis
SmarterMail before build 9518 allows unauthenticated attackers to exploit a path traversal flaw in the background preview endpoint by supplying base64-encoded UNC paths, forcing the Windows service to initiate SMB connections to attacker-controlled servers. This enables credential coercion and NTLM relay attacks without requiring authentication or user interaction. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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