All vulnerabilities
CVE-2026-24423

SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

SmarterTools SmarterMail
Open in ThreatlineRecord JSON
CVSS
9.3Critical
ExploitationExploited in the wildAdded to KEV 5 Feb 2026. Known ransomware useCISA KEV
Exploit odds (EPSS)88.2%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in100.0.9511Fixed versionCVE List
Federal deadline26 Feb 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 23 Jan 2026, 16:53 UTCPublishedCVE List
  2. 5 Feb 2026Added to CISA KEVCISA KEV

Public exploit code and templates 1

  • Scanner templateSmarterMail - Remote Code ExecutionNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

SmarterTools SmarterMail contains a missing authentication for critical function vulnerability in the ConnectToHub API method. This could allow the attacker to point the SmarterMail instance to a malicious HTTP server which serves the malicious OS command and could lead to command execution.

Text from CVE List

Affected versions 1

  • SmarterMailaffected: all versions before 100.0.9511CVE List

References 6