CVE-2026-24423
SmarterTools SmarterMail
Published 23 Jan 2026 · updated 4 Aug 2026 · Analyzed
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 5 Feb 2026, with a remediation deadline of 26 Feb 2026 for US federal agencies. It has been used in ransomware campaigns.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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.
References
- code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail · Third Party Advisory
- www.smartertools.com/smartermail/release-notes/current · Release Notes
- www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api · Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423 · US Government Resource