ACTIVELY EXPLOITED
CVE-2026-24423: SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability
| Vendor | SmarterTools |
|---|---|
| Product | SmarterMail |
| Actively exploited | Yes |
| Added to CISA KEV | 5 Feb 2026 |
| CISA federal deadline | 26 Feb 2026 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-306 |
Required action (CISA's text)
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 (NVD)
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.
SOURCES
Other SmarterTools flaws
- CVE-2026-23760: SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
- CVE-2025-52691: SmarterTools SmarterMail Unrestricted Upload of File with Dangerous Type Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.