SmarterTools SmarterMail

What it is

SmarterTools SmarterMail contains a missing authentication for critical function vulnerability in the ConnectToHub API method. This could allow the attacker to point the SmarterMail instance to a malicious HTTP server which serves the malicious OS command and could lead to command execution.

What to do

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor notices and references

• www.smartertools.com/smartermail/release-notes/current
• www.cve.org/CVERecord?id=CVE-2026-24423
• nvd.nist.gov/vuln/detail/CVE-2026-24423

Description and required action as published by CISA. Full record at NVD.