Vulnerability in Smartertools Smartermail
CVE-2026-25067
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Smartertools Smartermail — versions 0
Weakness classification (CWE)
References
- www.smartertools.com/smartermail/release-notes/current (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-backgroun… (VDB Entry, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-25067?
- CVE-2026-25067 is a medium-severity vulnerability in Smartertools Smartermail, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 5.3/10. Published 2026-01-29.
- How severe is CVE-2026-25067?
- Medium severity. CVSS v3 base score is 5.3 out of 10.