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CVE-2026-24423

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

CRITICAL
9.8
CVSS Score
Published: January 23, 2026 at 04:53 PM UTC
Updated: August 4, 2026 at 05:35 AM UTC
1 product affected across 1 vendorSmarterMail

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 88%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score88.2%

EPSS (Exploit Prediction Scoring System) estimates a 88.2% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be 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.

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.
Ransomware Use
Known
Added to KEV
Feb 5, 2026
Remediation Due
Feb 26, 2026
249 days overdue
Notes
https://www.smartertools.com/smartermail/release-notes/current
https://www.cve.org/CVERecord?id=CVE-2026-24423
https://nvd.nist.gov/vuln/detail/CVE-2026-24423

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SmarterMail· Smartertools
95%
v < 100.0.9511
Affected range stops below 100.0.9511, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Release NotesPatch
Source: cverecord
https://www.smartertools.com/smartermail/release-notes/current
Third Party Advisory
Source: cverecord
https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-306

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