CVE-2026-25067 SmarterTools SmarterMail < Build 9518 Unauthenticated background-of-the-day Path Coercion
Unauthenticated attackers can coerce SmarterMail to initiate SMB connections to attacker-controlled hosts, enabling NTLM relay and credential theft.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25067?
CVE-2026-25067 is a medium-severity server-side request forgery vulnerability in SmarterTools SmarterMail, published on 29 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-706
Which versions are affected by CVE-2026-25067?
It affects 1 product.
Products include Smartertools Smartermail.
How do I fix CVE-2026-25067?
No fix has been published for CVE-2026-25067 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-25067 being exploited?
There is no known exploitation of CVE-2026-25067 in the wild and no public exploit code.
Other vulnerabilities in SmarterTools SmarterMail
- CVE-2025-52691 SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type
- CVE-2026-24423 SmarterTools SmarterMail Missing Authentication for Critical Function
- CVE-2026-23760 SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel
- CVE-2021-32234 Code injection in n/a
- CVE-2019-7214 Deserialization in n/a
Sources
Also known as GHSA-x74x-r4q4-c3rw.