Vulnerability-Lookup

CVE-2026-21411 (GCVE-0-2026-21411)

Vulnerability from cvelistv5 – Published: 2026-01-06 06:34 – Updated: 2026-01-06 14:49

Summary

Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.

Severity ?

8.8 (High)


                        
                          CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

8.7 (High)


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

CWE

CWE-288 - Authentication Bypass Using an Alternate Path or Channel

Assigner

jpcert

References

URL

Tags

	https://www.plathome.co.jp/support/software/fw5/d…
	https://jvn.jp/en/vu/JVNVU97172240/

Impacted products

Vendor

Product

Version

Plat'Home Co.,Ltd.

OpenBlocks IoT DX1 (FW5.0.x)

Affected: all versions prior to FW5.0.8

Plat'Home Co.,Ltd.	OpenBlocks IoT EX/BX models (FW5.0.x)	Affected: all versions prior to FW5.0.8
Plat'Home Co.,Ltd.	OpenBlocks IX9 models with FW (FW5.0.x)	Affected: all versions prior to FW5.0.8
Plat'Home Co.,Ltd.	OpenBlocks IoT VX2 (FW5.0.x)	Affected: all versions prior to FW5.0.8
Plat'Home Co.,Ltd.	OpenBlocks IDM RX1 (FW5.0.x)	Affected: all versions prior to FW5.0.8
Plat'Home Co.,Ltd.	OpenBlocks IoT FX1 (FW5.0.x)	Affected: all versions prior to FW5.0.8

Show details on NVD website

JSON

To clipboard

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GHSA-XM4X-3R5H-VWFR

Vulnerability from github – Published: 2026-01-06 09:30 – Updated: 2026-01-06 09:30

Details

Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.

Severity ?

8.8 (High)


                  
                    CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:A/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-2026-21411"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-06T07:15:43Z",
    "severity": "HIGH"
  },
  "details": "Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.",
  "id": "GHSA-xm4x-3r5h-vwfr",
  "modified": "2026-01-06T09:30:28Z",
  "published": "2026-01-06T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21411"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/vu/JVNVU97172240"
    },
    {
      "type": "WEB",
      "url": "https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:A/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"
    }
  ]
}

FKIE_CVE-2026-21411

Vulnerability from fkie_nvd - Published: 2026-01-06 07:15 - Updated: 2026-01-08 18:09

Severity ?

8.8 (High) - CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.

References

	URL	Tags
	vultures@jpcert.or.jp	https://jvn.jp/en/vu/JVNVU97172240/
	vultures@jpcert.or.jp	https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password."
    }
  ],
  "id": "CVE-2026-21411",
  "lastModified": "2026-01-08T18:09:23.230",
  "metrics": {
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "vultures@jpcert.or.jp",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:A/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "vultures@jpcert.or.jp",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-06T07:15:43.870",
  "references": [
    {
      "source": "vultures@jpcert.or.jp",
      "url": "https://jvn.jp/en/vu/JVNVU97172240/"
    },
    {
      "source": "vultures@jpcert.or.jp",
      "url": "https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/"
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ],
      "source": "vultures@jpcert.or.jp",
      "type": "Primary"
    }
  ]
}

JVNDB-2026-001001

Vulnerability from jvndb - Published: 2026-01-07 10:46 - Updated:2026-01-07 10:46

Severity ?

8.8 (High) - cvssV3_0 - CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

Authentication bypass vulnerability in OpenBlocks series

Details

OpenBlocks series provided by Plat'Home Co.,Ltd. contains the following vulnerability.

Authentication bypass (CWE-288) - CVE-2026-21411

Chuya Hayakawa of 00One, Inc. reported this vulnerability to JPCERT/CC. JPCERT/CC coordinated with the developer.

References

Type

URL

	JVN	https://jvn.jp/en/vu/JVNVU97172240/index.html
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-21411
	Authentication Bypass Using an Alternate Path or Channel(CWE-288)	https://cwe.mitre.org/data/definitions/288.html

Impacted products

Vendor

Product

	Plat'Home Co., Ltd.	OpenBlocks IDM RX1
	Plat'Home Co., Ltd.	OpenBlocks IoT DX1
	Plat'Home Co., Ltd.	OpenBlocks IoT EX/BX models
	Plat'Home Co., Ltd.	OpenBlocks IoT FX1
	Plat'Home Co., Ltd.	OpenBlocks IoT VX2
	Plat'Home Co., Ltd.	OpenBlocks IX9 models with FW

Show details on JVN DB website

JSON

To clipboard

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  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-001001.html",
  "dc:date": "2026-01-07T10:46+09:00",
  "dcterms:issued": "2026-01-07T10:46+09:00",
  "dcterms:modified": "2026-01-07T10:46+09:00",
  "description": "OpenBlocks series provided by Plat\u0027Home Co.,Ltd. contains the following vulnerability.\u003cul\u003e\u003cli\u003eAuthentication bypass (CWE-288) - CVE-2026-21411\u003c/li\u003e\u003c/ul\u003eChuya Hayakawa of 00One, Inc. reported this vulnerability to JPCERT/CC.\r\nJPCERT/CC coordinated with the developer.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-001001.html",
  "sec:cpe": [
    {
      "#text": "cpe:/o:plathome:openblocks_idm_rx1_firmware",
      "@product": "OpenBlocks IDM RX1",
      "@vendor": "Plat\u0027Home Co., Ltd.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/o:plathome:openblocks_iot_dx1_firmware",
      "@product": "OpenBlocks IoT DX1",
      "@vendor": "Plat\u0027Home Co., Ltd.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/o:plathome:openblocks_iot_ex_bx_firmware",
      "@product": "OpenBlocks IoT EX/BX models",
      "@vendor": "Plat\u0027Home Co., Ltd.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/o:plathome:openblocks_iot_fx1_firmware",
      "@product": "OpenBlocks IoT FX1",
      "@vendor": "Plat\u0027Home Co., Ltd.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/o:plathome:openblocks_iot_vx2_firmware",
      "@product": "OpenBlocks IoT VX2",
      "@vendor": "Plat\u0027Home Co., Ltd.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/o:plathome:openblocks_ix9_with_fw_firmware",
      "@product": "OpenBlocks IX9 models with FW",
      "@vendor": "Plat\u0027Home Co., Ltd.",
      "@version": "2.2"
    }
  ],
  "sec:cvss": {
    "@score": "8.8",
    "@severity": "High",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-001001",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/vu/JVNVU97172240/index.html",
      "@id": "JVNVU#97172240",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-21411",
      "@id": "CVE-2026-21411",
      "@source": "CVE"
    },
    {
      "#text": "https://cwe.mitre.org/data/definitions/288.html",
      "@id": "CWE-288",
      "@title": "Authentication Bypass Using an Alternate Path or Channel(CWE-288)"
    }
  ],
  "title": "Authentication bypass vulnerability in OpenBlocks series"
}

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-2026-21411 (GCVE-0-2026-21411)

GHSA-XM4X-3R5H-VWFR

FKIE_CVE-2026-21411

JVNDB-2026-001001

Tags

Sightings

Nomenclature