CVE Watch—

CVE-2026-24423

SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

CVSS

—

No CVSS

EPSS

87.7%

p100

KEV

YES

Feb 5, 2026

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

87.7%EPSS · 30 days87.7%

2026-06-302026-07-16

KEV catalog record

Product

SmarterTools / SmarterMail

Vulnerability

SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

Added to KEV

Feb 5, 2026

Remediate by

Feb 26, 2026

Known ransomware use

Yes

Summary 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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