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TI-2026-20248 Aliases CVE-2026-25067GHSA-x74x-r4q4-c3rw

SmarterTools SmarterMail < Build 9518 Unauthenticated background-of-the-day Path Coercion

Priority LOW 36CWE-706Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00307 23rd percentileScored 2026-11-07
Fix Fixed SmarterMail (SmarterTools): 100.0.9518

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SmarterToolsSmarterMailbefore 100.0.9518100.0.9518Patch availableCNA
  • SmarterMail VendorSmarterTools Affected before 100.0.9518 Fixed in 100.0.9518 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:*before 100.0.9518VulnerableSmarterTools
  • cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:* Versions before 100.0.9518 Vulnerable ·SmarterTools

Remediation

  • Fix · CNA SmarterMail (SmarterTools) Fixed in 100.0.9518

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25067
  2. 2026-10-03 Alias added: GHSA-x74x-r4q4-c3rw

References

Patch 1

  • TI-2025-32755 Upload arbitrary files in SmarterTools SmarterMail KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-19690 SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-19133 SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API KEVCVSS 4.0CRITICAL 9.3
  • TI-2019-05110 SmarterTools SmarterMail 16.x before build 6985 allows deserialization of untrusted data. CVSS 3.0CRITICAL 9.8
  • TI-2019-05109 SmarterTools SmarterMail 16.x before build 6985 allows directory traversal. CVSS 3.0MEDIUM 6.5
  • TI-2021-12079 SmarterTools SmarterMail 16.x through 100.x before 100.0.7803 allows remote code execution. CVSS 3.1CRITICAL 9.8
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences