Vulnerability-Lookup

CVE-2026-24423 (GCVE-0-2026-24423)

Vulnerability from cvelistv5 – Published: 2026-01-23 16:53 – Updated: 2026-02-06 04:55

Title

SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API

Summary

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.

Severity ?

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

CWE

CWE-306 - Missing Authentication for Critical Function

Assigner

VulnCheck

References

URL

Tags

	https://www.smartertools.com/smartermail/release-…	release-notespatch
	https://code-white.com/public-vulnerability-list/…	third-party-advisory
	https://www.vulncheck.com/advisories/smartertools…	third-party-advisory

Impacted products

	Vendor	Product	Version
	SmarterTools	SmarterMail	Affected: 0 , < 100.0.9511 (semver)

Credits

Sina Kheirkhah & Piotr Bazydlo of watchTowr Markus Wulftange of CODE WHITE GmbH Cale Black of VulnCheck

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-24423

Vulnerability from fkie_nvd - Published: 2026-01-23 17:16 - Updated: 2026-02-06 16:45

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
disclosure@vulncheck.com	https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail	Third Party Advisory
disclosure@vulncheck.com	https://www.smartertools.com/smartermail/release-notes/current	Release Notes
disclosure@vulncheck.com	https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api	Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423	US Government Resource

Impacted products

	Vendor	Product	Version
	smartertools	smartermail	*

JSON

To clipboard

{
  "cisaActionDue": "2026-02-26",
  "cisaExploitAdd": "2026-02-05",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
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        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-7JPW-FM5P-F98M

Vulnerability from github – Published: 2026-01-23 18:31 – Updated: 2026-02-06 18:30

Details

Severity ?

9.8 (Critical)


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

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-24423"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-23T17:16:13Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-7jpw-fm5p-f98m",
  "modified": "2026-02-06T18:30:28Z",
  "published": "2026-01-23T18:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24423"
    },
    {
      "type": "WEB",
      "url": "https://code-white.com/public-vulnerability-list/#systemadminsettingscontrollerconnecttohub-missing-authentication-in-smartermail"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24423"
    },
    {
      "type": "WEB",
      "url": "https://www.smartertools.com/smartermail/release-notes/current"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/smartertools-smartermail-unauthenticated-rce-via-connecttohub-api"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

NCSC-2026-0040

Vulnerability from csaf_ncscnl - Published: 2026-01-27 10:51 - Updated: 2026-02-06 09:25

Summary

Kwetsbaarheid verholpen in SmarterTools SmarterMail

Notes

The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.

Feiten

SmarterTools heeft kwetsbaarheden verholpen in SmarterMail.

Interpretaties

Een kwaadwillende kan de kwetsbaarheden misbruiken om authenticatie te omzeilen en willekeurige code uit te voeren met rechten van de beheerder, en mogelijk SYSTEM. Voor succesvol misbruik moet de kwaadwillende toegang hebben tot de API-interface (met name de `/api/v1/auth/force-reset-password` endpoint) en kan op die manier zonder voorafgaande authenticatie het wachtwoord van een beheerder resetten door middel van een speciaal geprepareerd HTTP-verzoek. Ook kan een kwaadwillende een malafide HTTP-server inrichten, om daarmee een slachtoffer te misleiden deze te bezoeken en zo willekeurige code uit te voeren op de kwetsbare server. Voor de kwetsbaarheid met kenmerk CVE-2026-23760 is Proof-of-Concept-code gepubliceerd en het Amerikaanse CISA heeft de kwetsbaarheid op de Known Exploited Vulnerabilities-lijst geplaatst, wat aangeeft dat de kwetsbaarheid actief is misbruikt. **Update** Er wordt inmiddels ook misbruik waargenomen van de kwetsbaarheid met kenmerk CVE-2026-24423, waarmee een kwaadwillende willekeurige code kan uitvoeren op de kwetsbare server. Er is (nog) geen publieke Proof-of-Concept-code of exploit beschikbaar, en voor zover bekend vereist misbruik een speciaal ingerichte server onder controle van de kwaadwillende.

Oplossingen

SmarterTools heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie. Het NCSC adviseert onderzoek te doen naar de SmarterMail-omgeving en met name te controleren of van beheerdersaccounts recentelijk het wachtwoord is gewijzigd.

Kans

high

Schade

high

CWE-288

Authentication Bypass Using an Alternate Path or Channel

CWE-306

Missing Authentication for Critical Function

JSON

To clipboard

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "SmarterTools heeft kwetsbaarheden verholpen in SmarterMail.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "Een kwaadwillende kan de kwetsbaarheden misbruiken om authenticatie te omzeilen en willekeurige code uit te voeren met rechten van de beheerder, en mogelijk SYSTEM.\n\nVoor succesvol misbruik moet de kwaadwillende toegang hebben tot de API-interface (met name de `/api/v1/auth/force-reset-password` endpoint) en kan op die manier zonder voorafgaande authenticatie het wachtwoord van een beheerder resetten door middel van een speciaal geprepareerd HTTP-verzoek. Ook kan een kwaadwillende een malafide HTTP-server inrichten, om daarmee een slachtoffer te misleiden deze te bezoeken en zo willekeurige code uit te voeren op de kwetsbare server.\n\nVoor de kwetsbaarheid met kenmerk CVE-2026-23760 is Proof-of-Concept-code gepubliceerd en het Amerikaanse CISA heeft de kwetsbaarheid op de Known Exploited Vulnerabilities-lijst geplaatst, wat aangeeft dat de kwetsbaarheid actief is misbruikt.\n\n**Update** Er wordt inmiddels ook misbruik waargenomen van de kwetsbaarheid met kenmerk CVE-2026-24423, waarmee een kwaadwillende willekeurige code kan uitvoeren op de kwetsbare server. Er is (nog) geen publieke Proof-of-Concept-code of exploit beschikbaar, en voor zover bekend vereist misbruik een speciaal ingerichte server onder controle van de kwaadwillende.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "SmarterTools heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.\n\nHet NCSC adviseert onderzoek te doen naar de SmarterMail-omgeving en met name te controleren of van beheerdersaccounts recentelijk het wachtwoord is gewijzigd.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Authentication Bypass Using an Alternate Path or Channel",
        "title": "CWE-288"
      },
      {
        "category": "general",
        "text": "Missing Authentication for Critical Function",
        "title": "CWE-306"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://www.smartertools.com/smartermail/release-notes/current"
      }
    ],
    "title": "Kwetsbaarheid verholpen in SmarterTools SmarterMail",
    "tracking": {
      "current_release_date": "2026-02-06T09:25:57.008166Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0040",
      "initial_release_date": "2026-01-27T10:51:39.476320Z",
      "revision_history": [
        {
          "date": "2026-01-27T10:51:39.476320Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        },
        {
          "date": "2026-02-06T09:25:57.008166Z",
          "number": "1.0.1",
          "summary": "Er wordt ook actief misbruik waargenomen van de kwetsbaarheid met kenmerk CVE-2026-24423."
        }
      ],
      "status": "final",
      "version": "1.0.1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "SmarterMail"
          }
        ],
        "category": "vendor",
        "name": "SmarterTools"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-23760",
      "cwe": {
        "id": "CWE-288",
        "name": "Authentication Bypass Using an Alternate Path or Channel"
      },
      "notes": [
        {
          "category": "other",
          "text": "Authentication Bypass Using an Alternate Path or Channel",
          "title": "CWE-288"
        },
        {
          "category": "description",
          "text": "SmarterTools SmarterMail versions prior to build 9511 have a critical authentication bypass vulnerability in the password reset API, allowing unauthorized attackers to reset admin accounts and gain full access.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "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",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-23760 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-23760.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1"
          ]
        }
      ],
      "title": "CVE-2026-23760"
    },
    {
      "cve": "CVE-2026-24423",
      "cwe": {
        "id": "CWE-306",
        "name": "Missing Authentication for Critical Function"
      },
      "notes": [
        {
          "category": "other",
          "text": "Missing Authentication for Critical Function",
          "title": "CWE-306"
        },
        {
          "category": "description",
          "text": "SmarterTools SmarterMail has a critical vulnerability in the ConnectToHub API method, allowing unauthenticated remote code execution, particularly in versions prior to build 9511.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-24423 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-24423.json"
        }
      ],
      "title": "CVE-2026-24423"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-24423 (GCVE-0-2026-24423)

FKIE_CVE-2026-24423

GHSA-7JPW-FM5P-F98M

NCSC-2026-0040

Tags

Sightings

Nomenclature