CVE-2026-24423SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API
Updated under an hour ago ()
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It affects SmarterTools SmarterMail. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Feb 5, 2026; federal agencies had to remediate by Feb 26, 2026, and it is known to be used in ransomware. Treat that date as your deadline.
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SmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.
- CVSS
- 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-306
- Known exploited
- Added to CISA KEV Feb 5, 2026; federal remediation due Feb 26, 2026; known ransomware useApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 88.18% (percentile 100)
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Aug 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
SmarterTools SmarterMail smartertools:smartermail (from the name) | before 100.0.9511 | CNA record |
smartertools smartermail smartertools:smartermail | before 100.0.9511 | NVD |
References
- https://www.smartertools.com/smartermail/release-notes/currentrelease-notes, patch
- https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermailthird-party-advisory
- https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-apithird-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.