Unauthenticated Remote Code Execution Vulnerability in SmarterMail by SmarterTools
CVE-2026-24423

9.3CRITICAL

Key Information:

Vendor

Smartertools

Status
Smartermail
Vendor
CVE Published:
23 January 2026

Badges

💰 Ransomware👾 Exploit Exists🟡 Public PoC🟣 EPSS 18%🦅 CISA Reported

What is CVE-2026-24423?

SmarterMail versions earlier than build 9511 are susceptible to an unauthenticated remote code execution vulnerability via the ConnectToHub API method. An attacker can exploit this weakness by directing the application to a malicious HTTP server that delivers harmful OS commands, which are then executed by the affected SmarterMail application. Organizations using these affected versions should implement necessary updates to mitigate this vulnerability.

CISA has reported CVE-2026-24423

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-24423 as being exploited and is known by the CISA as enabling ransomware campaigns.

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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Affected Version(s)

SmarterMail 0 < 100.0.9511

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-24423
Created by aavamin

References

https://www.smartertools.com/smartermail/release-notes/cu...
release-notespatch
https://code-white.com/public-vulnerability-list/#systema...
third-party-advisory
https://www.vulncheck.com/advisories/smartertools-smarter...
third-party-advisory

EPSS Score

18% chance of being exploited in the next 30 days.

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 💰

    Used in Ransomware

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sina Kheirkhah & Piotr Bazydlo of watchTowr
Markus Wulftange of CODE WHITE GmbH
Cale Black of VulnCheck
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