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CRITICAL CISA KEV Actively Exploited

CVE-2026-24423

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

CVSS v3

9.8

CRITICAL

EPSS Score

82.0 %

exploit probability

CISA KEV

Yes

known exploited

Exploitation

active

SSVC status

Description

SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.

CISA Known Exploited Vulnerability

Date Added
2026-02-05
Patch Due Date
2026-02-26
Ransomware Use
Known

Technical details

CVSS v3 Vector
3.1
Published
2026-01-23
Last Modified
2026-02-06

Frequently asked questions

What is CVE-2026-24423?

SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.

Is CVE-2026-24423 actively exploited?

Yes. CVE-2026-24423 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2/26/2026.

What is the CVSS score for CVE-2026-24423?

CVE-2026-24423 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.

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