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Vulnerability Details :

CVE-2026-21411

Summary
Assigner-jpcert
Assigner Org ID-ede6fdc4-6654-4307-a26d-3331c018e2ce
Published At-06 Jan, 2026 | 06:34
Updated At-06 Jan, 2026 | 14:49
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:jpcert
Assigner Org ID:ede6fdc4-6654-4307-a26d-3331c018e2ce
Published At:06 Jan, 2026 | 06:34
Updated At:06 Jan, 2026 | 14:49
Rejected At:
▼CVE Numbering Authority (CNA)

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.

Affected Products
Vendor
Plat'Home Co.,Ltd.
Product
OpenBlocks IoT DX1 (FW5.0.x)
Versions
Affected
  • all versions prior to FW5.0.8
Vendor
Plat'Home Co.,Ltd.
Product
OpenBlocks IoT EX/BX models (FW5.0.x)
Versions
Affected
  • all versions prior to FW5.0.8
Vendor
Plat'Home Co.,Ltd.
Product
OpenBlocks IX9 models with FW (FW5.0.x)
Versions
Affected
  • all versions prior to FW5.0.8
Vendor
Plat'Home Co.,Ltd.
Product
OpenBlocks IoT VX2 (FW5.0.x)
Versions
Affected
  • all versions prior to FW5.0.8
Vendor
Plat'Home Co.,Ltd.
Product
OpenBlocks IDM RX1 (FW5.0.x)
Versions
Affected
  • all versions prior to FW5.0.8
Vendor
Plat'Home Co.,Ltd.
Product
OpenBlocks IoT FX1 (FW5.0.x)
Versions
Affected
  • all versions prior to FW5.0.8
Problem Types
TypeCWE IDDescription
CWECWE-288Authentication Bypass Using an Alternate Path or Channel
Type: CWE
CWE ID: CWE-288
Description: Authentication Bypass Using an Alternate Path or Channel
Metrics
VersionBase scoreBase severityVector
3.08.8HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.08.7HIGH
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
Version: 3.0
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/
N/A
https://jvn.jp/en/vu/JVNVU97172240/
N/A
Hyperlink: https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/
Resource: N/A
Hyperlink: https://jvn.jp/en/vu/JVNVU97172240/
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:vultures@jpcert.or.jp
Published At:06 Jan, 2026 | 07:15
Updated At:08 Jan, 2026 | 18:09

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.7HIGH
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
Secondary3.08.8HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
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: Secondary
Version: 3.0
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-288Primaryvultures@jpcert.or.jp
CWE ID: CWE-288
Type: Primary
Source: vultures@jpcert.or.jp
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://jvn.jp/en/vu/JVNVU97172240/vultures@jpcert.or.jp
N/A
https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/vultures@jpcert.or.jp
N/A
Hyperlink: https://jvn.jp/en/vu/JVNVU97172240/
Source: vultures@jpcert.or.jp
Resource: N/A
Hyperlink: https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/
Source: vultures@jpcert.or.jp
Resource: N/A

Change History

0
Information is not available yet

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