Risk Letters

Exploited vulnerability

CVE-2026-24423

TLP:CLEAR

SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

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.

Facts

  • Vendor: SmarterTools
  • Product: SmarterMail
  • CVSS: 9.3
  • EPSS (probability of exploitation within 30 days): 88.2 %
  • On CISA's Known Exploited Vulnerabilities list since: 5 February 2026
  • First known exploitation: 5 February 2026
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 26 February 2026
  • Weakness: CWE-306
  • First seen by Risk Letters: 5 February 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD