CVE-2026-24423
CRITICAL Actively ExploitedSmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
CVSS v3
9.8
CRITICAL
EPSS Score
82.0%
exploit probability
CISA KEV
No
known exploited
Exploitation
active
SSVC status
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.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 1/23/2026
- Last Modified
- 2/6/2026
Frequently Asked Questions
What is CVE-2026-24423?
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.
Is CVE-2026-24423 actively exploited?
Yes. CVE-2026-24423 has been observed in active exploitation according to SSVC analysis.
What is the CVSS score for CVE-2026-24423?
CVE-2026-24423 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string 3.1.
Is CVE-2026-24423 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.