February 5, 2026 · Applied Cybernetics Group
CVE-2026-24423 — SmarterTools SmarterMail
known ransomware use
SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability
- Added to KEV
2026-02-05- Federal due date
2026-02-26- Vendor
- SmarterTools
- Product
- SmarterMail
- EPSS
- 99.7th percentile (score 0.877, as of
2026-07-13) - NVD CVSS v3.1
- 9.8 (CRITICAL)
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-24423
CISA short 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.
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.
NVD 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.