Unauthenticated Path Coercion Vulnerability in SmarterMail by SmarterTools
CVE-2026-25067

6.9MEDIUM

Key Information:

Vendor

Smartertools

Status
Smartermail
Vendor
CVE Published:
29 January 2026

What is CVE-2026-25067?

SmarterMail, developed by SmarterTools, contains a vulnerability that allows unauthenticated attackers to exploit the background-of-the-day preview endpoint. By inputting specially crafted data, attackers can manipulate file system paths as the application decodes the input without proper validation. On Windows platforms, this vulnerability can trigger outbound Server Message Block (SMB) authentication attempts towards maliciously controlled hosts, facilitating a range of attacks including credential coercion and NTLM relay. It is crucial for users to update to build 9518 or later to mitigate these risks.

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Deploy the Patch

Affected Version(s)

SmarterMail 0 < 100.0.9518

References

https://www.smartertools.com/smartermail/release-notes/cu...
release-notespatch
https://www.vulncheck.com/advisories/smartertools-smarter...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Cale Black of VulnCheck
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