Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since February 5, 2026.
CVE-2026-24423
SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability
Added to KEV February 5, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-24423
- CWE
- CWE-306
- Affected products
- SmarterMail · SmarterTools SmarterMail · SmarterTools
What happened
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.
What it means for your business
SmarterTools SmarterMail is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-24423). 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. CISA remediation due date: 2026-02-26. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: February 26, 2026
Sources
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