SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9.8 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

9.22 %

Predictive Probability

Percentile Rank

92.5 th

Documented as more likely to be exploited than 92.5% of known CVEs.

Detection Date

Feb 05, 2026

Remediation Due

Feb 26, 2026

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

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

Asset Context

Vendor Identity

SmarterTools

Affected Product

SmarterMail

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-306

External Intelligence

https://www.smartertools.com/smartermail/release-notes/current

https://www.cve.org/CVERecord?id=CVE-2026-24423

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2026-24423