CVE-2026-24423
SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
- Published
- Jan 23, 2026
- Updated
- Aug 4, 2026
- Assigning CNA
- VulnCheck
- Evidence observed
- Feb 5, 2026
Primary CVSS
nvd · CVSS 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XHigh · next 30 days
- Percentile
- 99.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
2Reproduction script for CVE-2026-24423, a trust boundary violation in SmarterMail ConnectToHub leading to SSRF and potential remote code execution. Includes a simulated Hub server and instructions for triggering the vulnerable API.
- SmarterMail-CVE-2026-24423Exploit
Exploit for CVE-2026-24423 — a critical unauthenticated RCE in SmarterMail's ConnectToHub API. Affects all builds prior to 9511.
Responsible use
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