Skip to main content

CVE-2026-24423

SmarterTools — SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

SmarterTools · CWE-306 · in CISA KEV since 2026-02-05

ExigentCISA federal deadline · Overdue by 8 monthsRansomwareCISA KEVActively Exploited
93

EVRS 93 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 99 of 2,960 tracked

Download PDF

Why it scores 93

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and associated with known ransomware campaigns.

  • CISA KEVApplied
  • RansomwareApplied
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

smartermail: update to 100.0.9511 or later

Affected versions

  • smartermail< 100.0.9511

Remediation

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

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.3 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.882 (99.77th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Known CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2026-02-26 · CISA federal deadline · Overdue by 8 months CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.3 (v4.0), assigned by VulnCheck. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do