CVE-2026-24423 — SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

Known ransomware use CISA KEV listed Added February 5, 2026 Remediate by February 26, 2026

Description

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.

Required action

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

Notes

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

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