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Vulnerabilities

Vulnerability · CVE-2026-24423

SmarterTools SmarterMail Missing Authentication for Critical Function Vulnerability

Published Jan 23, 2026 · catalog updated Aug 3, 2026 · SmarterTools SmarterMail

Patch now

CVE-2026-24423 is in the CISA known-exploited catalog, due Feb 26, 2026. Confirm SmarterTools SmarterMail against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.3
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
88.18%
Remediation
Remediation guidance
Affected products
cpe smartertools/smartermail · vendor SmarterTools SmarterMail

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. VulnCheck canary evidence. Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe smartertools/smartermailversion unspecified
  • vendor SmarterTools SmarterMailversion unspecified

How to fix CVE-2026-24423

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-24423 is in the CISA known-exploited catalog, due Feb 26, 2026. Confirm SmarterTools SmarterMail against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-306: Missing Authentication for Critical Function. EPSS 88.18%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 23, 2026 · Catalog

    Detected

    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.

  2. Feb 5, 2026 · CISA KEV

    Known exploited

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

  3. Feb 26, 2026 · CISA KEV

    Remediation due

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

  4. Aug 3, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2026-24423

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2026-24423

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-24423

    30-day exploitation probability 88.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-24423

    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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-24423

    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 comman

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.