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CVE-2026-24423: SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

criticalknown exploitedpublic exploitCVE-2026-24423
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: SmarterToolsproduct: SmarterMailAuthentication bypass
What
A missing authentication for critical function vulnerability could allow an attacker to execute commands.
Who is affected
Deployments of SmarterTools SmarterMail.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the security update from SmarterTools.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-02-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-24423

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-24423coverage & exploitation statusNVD · CVE.org

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