SB2026020614 - NTLM hash disclosure in SmarterTools SmarterMail

Description

This security bulletin contains information about 1 vulnerability.

1) Use of incorrectly-resolved name or reference (CVE-ID: CVE-2026-25067)

CWE-ID: CWE-706 - Use of Incorrectly-Resolved Name or Reference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a path coercion in the background-of-the-day preview endpoint when the application encodes untrusted input and uses it as a filesystem path without validation. A remote attacker can force the application to initiate outbound SMB authentication attempts to attacker-controlled servers and obtain NTLM hash that can be used later in NTLM relay attacks.

Remediation

Install update from vendor's website.

References

• https://www.smartertools.com/smartermail/release-notes/current
• https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-background-of-the-day-path-coercion