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
- 99.3th percentile (score 0.834, as of
2026-06-08) - NVD CVSS v3.1
- —
- 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.