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

> CVE-2026-24423: SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-24423
Last updated: 2026-08-04T05:16:38Z

- Published: 2026-01-23 16:53 UTC · Updated: 2026-08-04 05:16 UTC · Assigner: VulnCheck
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 88.2%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-02-05, federal due date 2026-02-26, ransomware use: Known
- CWE: CWE-306

## 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 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.

## Affected vendors and products

- SmarterTools: SmarterMail

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-24423)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-24423)
- [https://code-white.com/public-vulnerability-list/\#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail](https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail)
- [https://www.smartertools.com/smartermail/release-notes/current](https://www.smartertools.com/smartermail/release-notes/current)
- [https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api](https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-24423 · Markdown: https://rewindex.com/cve/CVE-2026-24423.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-24423 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:34.248Z