Vulnerabilities CVE-2026-24423

CVE-2026-24423

Critical

Open

KEV

TLP:CLEAR

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

NVD CVE.org

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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.

Details

CVSS Score: 9.3
EPSS Score ⓘ: 87.69%

99.7th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence: 100%
Published: Jan 23, 2026
Last Modified: Aug 4, 2026
CISA KEV
Date Added: Feb 5, 2026
Patch Due: Feb 26, 2026
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.

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