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CVE-2026-24423— SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

Quick assessment

Affected
SmarterTools SmarterMail
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SmarterTools SmarterMail是SmarterTools公司的一套邮件服务器软件。该软件支持垃圾邮件过滤、数据统计、简单邮件传输协议SMTP验证等功能。 SmarterTools SmarterMail build 9511之前版本存在访问控制错误漏洞，该漏洞源于ConnectToHub API方法存在未经身份验证的远程代码执行，可能导致执行任意OS命令。

CVSS 9.3 · Critical KEV · Ransomware EPSS 87.69% · P100

Public Exploits 1

Nuclei · 1 CVE-2026-24423.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
SmarterTools SmarterMail < 100.0.9511 affected
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I. Basic Information for CVE-2026-24423

Vulnerability Information
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Vulnerability Title
SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
SmarterTools SmarterMail 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SmarterTools SmarterMail是SmarterTools公司的一套邮件服务器软件。该软件支持垃圾邮件过滤、数据统计、简单邮件传输协议SMTP验证等功能。 SmarterTools SmarterMail build 9511之前版本存在访问控制错误漏洞，该漏洞源于ConnectToHub API方法存在未经身份验证的远程代码执行，可能导致执行任意OS命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
SmarterTools SmarterMail 0 ~ 100.0.9511 -

II. Public POCs for CVE-2026-24423

# POC Description Source Link Shenlong Link
1 CVE-2026-24423 exp https://github.com/aavamin/CVE-2026-24423 POC Details
2 SmarterTools SmarterMail < build 9511 contains an unauthenticated remote code execution caused by malicious OS command execution via ConnectToHub API method, letting remote attackers execute arbitrary commands, exploit requires no authentication. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-24423.yaml POC Details
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III. Intelligence Information for CVE-2026-24423

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Vendor Advisories for CVE-2026-24423 (1)

Vendor Pages for CVE-2026-24423 (1)

IV. Related Vulnerabilities

Same product: SmarterMail
Same vendor: SmarterTools
Same weakness: CWE-306

V. Comments for CVE-2026-24423

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