CVE-2026-24423 · netVigilance record NV26-0023
SmarterTools SmarterMail Missing Authentication for Critical Function
past due ransomware
What to do
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 deadline 2026-02-26 · passed 6 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
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.
Who is affected
SmarterTools SmarterMail. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-306.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 6 months ago
Sources
- NVD entry for CVE-2026-24423 nvd.nist.gov/vuln/detail/CVE-2026-24423
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- smartertools.com www.smartertools.com/smartermail/release-notes/current
- cve.org www.cve.org/CVERecord?id=CVE-2026-24423
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2026-24423