CVE-2026-24423

Confirmed PUBLISHED

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

SmarterTools · SmarterMail

1 day faster than CISA KEV

Exploited in the wild Used in malware PoC available

Recommended Action

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

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Confidence

Confirmed

Exploitation Status

Exploited in the wild

Observed in Sensors

Attempts (30d)

—

Unique Attacker IPs

—

CISA KEV

In CISA KEV

CVSS / EPSS

9.3 Critical EPSS 87.7%

At a Glance

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.

cisa nuclei_scanner malware

CVE Published: Jan 23, 2026
Exploitation Reported: Jun 01, 2026
CVSS: 9.3 Critical
EPSS: 87.7%

Remote Low complexity No user interaction Unauthenticated

Affected Versions

Vendor	Product	Version	Status
SmarterTools	SmarterMail	0 to < 100.0.9511	Affected

CVE References

Patch — smartertools.com smartertools.com · Patch https://www.smartertools.com/smartermail/release-notes/current
Third-Party Advisory — code-white.com code-white.com · Third-Party Advisory https://code-white.com/public-vulnerability-list/#systemadminsettings...
Third-Party Advisory — vulncheck.com vulncheck.com · Third-Party Advisory https://www.vulncheck.com/advisories/smartertools-smartermail-unauthe...

Recommended Actions

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.

Known Exploited Vulnerability Sources

Catalogues that list this CVE as a known exploited vulnerability.

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

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Source	Added
CVE First	2026-06-01 10:50 UTC
CISA	2026-06-02 14:03 UTC
The Shadowserver	2026-07-08 00:00 UTC

Scanner Artifacts

Nuclei and Metasploit references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-24423.yaml	Jun 01, 2026

CVSS Scores

CVSS v4.0 9.3 Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS v3.1 9.8 Critical

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

Exploitation Status

Exploited in the wild

Recorded 2026-06-01 10:50:28 UTC · CVE

Used in malware

Recorded 2026-06-02 14:03:43 UTC · CVE

Proof of concept available

Recorded 2026-01-29 12:30:18 UTC · GitHub

Weaknesses (CWE)

CWE-306

Missing Authentication for Critical Function

Scanner Integrations

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-24423.yaml	Jun 01, 2026

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

aavamin/CVE-2026-24423

github · Created 2026-01-29 12:30:18 UTC · 7 stars

CVE-2026-24423 exp

SmarterMail - Remote Code Execution

nuclei · Created Unknown

Timeline

Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.

8 Jul 2026 00:00 UTC 10 days ago

8 Jul 2026 00:00 UTC · 10 days ago

KEV confirmed by The Shadowserver

Exploitation attested by an external source
2 Jun 2026 14:03 UTC about 2 months ago

2 Jun 2026 14:03 UTC · about 2 months ago

First public exploitation report

Exploit observed in malware
2 Jun 2026 14:03 UTC about 2 months ago

2 Jun 2026 14:03 UTC · about 2 months ago

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
1 Jun 2026 15:34 UTC about 2 months ago

1 Jun 2026 15:34 UTC · about 2 months ago

Nuclei template available

Scanner coverage available
1 Jun 2026 10:50 UTC about 2 months ago

1 Jun 2026 10:50 UTC · about 2 months ago

Added to KEVIntel KEV Feed

High-confidence, third-party attested exploitation
29 Jan 2026 12:30 UTC 6 months ago

29 Jan 2026 12:30 UTC · 6 months ago

Public PoC available

Public proof-of-concept code published
23 Jan 2026 16:53 UTC 6 months ago

23 Jan 2026 16:53 UTC · 6 months ago

CVE published

Vulnerability disclosed publicly
22 Jan 2026 18:21 UTC 6 months ago

22 Jan 2026 18:21 UTC · 6 months ago

CVE ID reserved

Identifier reserved by the CNA

Automate This Intelligence with the Pro API

Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Pro API Example

GET /api/v2/pro/kevs/CVE-2026-24423

{
  "cve_id": "CVE-2026-24423",
  "title": "SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API",
  "affected_vendor": "SmarterTools",
  "affected_product": "SmarterMail",
  "affected_versions": [
    { "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
  ],
  "confidence": "Confirmed",
  "cvss_score": 9.3,
  "epss_score": 0.87693,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "...": "Pro API fields" },
  "proof_of_concepts": [ "..." ],
  "scanner_integrations": [ "..." ]
}

The free JSON API returns basic KEV fields only. Confidence, telemetry, and artifact enrichment require Pro API access.

CVE-2026-24423

At a Glance

Affected Versions

CVE References

Recommended Actions

Known Exploited Vulnerability Sources

Scanner Artifacts

Virtual Patch

CVSS Scores

Exploitation Status

Weaknesses (CWE)

Scanner Integrations

Potential Proof of Concepts

Timeline

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