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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.

Scores

9.3
CVSS 9.3 out of 10, critical severity.
88.2%
EPSS 88.2% chance of exploitation in the next 30 days.

The facts

Published
23 January 2026
Last changed
4 August 2026
NVD status
Analyzed
Severity
Critical, CVSS 9.3 out of 10 (version 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…
Weakness
Affects
  • smartertools smartermail
Known exploited
Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 5 February 2026. CISA lists it as used in ransomware campaigns.
EPSS
88.2% chance of exploitation activity in the next 30 days (percentile 100).

Is there a Securelyn advisory?

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References