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

CISA Known Exploited Vulnerabilities

Name

SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

Vendor

SmarterTools

Product

SmarterMail

Added to the catalog

2026-02-05

Due date for US federal agencies

2026-02-26

Weaknesses

CWE-306

Catalog version

2026.10.30

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 (CISA)

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

Ransomware use: CISA marks this vulnerability as known to be used in ransomware campaigns. CISA does not say which group used it.

Links in CISA's 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

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2026-01-23T17:16:13.483

Last modified

2026-08-04T05:16:38.320

Weaknesses

CWE-306

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.

References

• https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail (Third Party Advisory)
• https://www.smartertools.com/smartermail/release-notes/current (Release Notes)
• https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api (Third Party Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:22.836Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-24423

CVE record

Title (CNA)

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

Assigner

VulnCheck

State

PUBLISHED

Published

2026-01-23T16:53:34.951Z

Updated

2026-08-04T03:56:04.225Z

Problem types

CWE-306 Missing Authentication for Critical Function

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.

References

• https://www.smartertools.com/smartermail/release-notes/current
• https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail
• https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api

Read on 2026-11-03T02:19:29.635Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/24xxx/CVE-2026-24423.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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