SmarterTools SmarterMail up to 100.0.9510 ConnectToHub API missing authentication

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in SmarterTools SmarterMail up to 100.0.9510. The impacted element is an unknown function of the component ConnectToHub API. The manipulation results in missing authentication. This vulnerability is known as CVE-2026-24423. It is possible to launch the attack remotely. Furthermore, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in SmarterTools SmarterMail up to 100.0.9510. It has been classified as critical. Affected is an unknown code block of the component ConnectToHub API. The manipulation with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was published by Sina Kheirkhah and Piotr Bazydlo. The advisory is available at smartertools.com. This vulnerability is traded as CVE-2026-24423 since 01/22/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but an exploit is available.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 298241 (SmarterMail < 100.0.9511 Unauthenticated RCE via ConnectToHub API (CVE-2026-24423)), which helps to determine the existence of the flaw in a target environment. This issue was added on 02/05/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 02/26/2026:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Upgrading to version 100.0.9511 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (298241), EUVD (EUVD-2026-4273) and CERT Bund (WID-SEC-2026-0133). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • SmarterTools SmarterMail

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing authentication
CWE: CWE-306 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Attacked

EPSS Score: 🔒
EPSS Percentile: 🔒

KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 298241
Nessus Name: SmarterMail < 100.0.9511 Unauthenticated RCE via ConnectToHub API (CVE-2026-24423)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: SmarterMail 100.0.9511

Timelineinfo

01/22/2026 CVE reserved
01/23/2026 +1 days Advisory disclosed
01/23/2026 +0 days VulDB entry created
02/07/2026 +15 days VulDB entry last update

Sourcesinfo

Advisory: smartertools.com
Researcher: Sina Kheirkhah, Piotr Bazydlo
Status: Confirmed

CVE: CVE-2026-24423 (🔒)
GCVE (CVE): GCVE-0-2026-24423
GCVE (VulDB): GCVE-100-342690
EUVD: 🔒
CERT Bund: WID-SEC-2026-0133 - SmarterTools SmarterMail: Mehrere Schwachstellen

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 01/23/2026 18:44
Updated: 02/07/2026 07:29
Changes: 01/23/2026 18:44 (68), 01/26/2026 11:25 (6), 02/05/2026 22:21 (13), 02/06/2026 02:29 (1), 02/06/2026 08:12 (1), 02/07/2026 03:43 (11), 02/07/2026 07:29 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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