CVE-2026-21411

HIGH

OpenBlocks IoT DX1/EX/BX/IX9/VX2/IDM RX1 < FW5.0.8 - Unauthenticated Authentication Bypass

Title source: llm

Description

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 (2)

Core 2

Core References

Various Sources

https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/

Third Party Advisory

https://jvn.jp/en/vu/JVNVU97172240/

Scores

CVSS v3 8.8

EPSS 0.0028

EPSS Percentile 19.4%

Attack Vector ADJACENT_NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-288

Status published

Products (6)

Plat'Home Co.,Ltd./OpenBlocks IDM RX1 (FW5.0.x) all versions prior to FW5.0.8

Plat'Home Co.,Ltd./OpenBlocks IoT DX1 (FW5.0.x) all versions prior to FW5.0.8

Plat'Home Co.,Ltd./OpenBlocks IoT EX/BX models (FW5.0.x) all versions prior to FW5.0.8

Plat'Home Co.,Ltd./OpenBlocks IoT FX1 (FW5.0.x) all versions prior to FW5.0.8

Plat'Home Co.,Ltd./OpenBlocks IoT VX2 (FW5.0.x) all versions prior to FW5.0.8

Plat'Home Co.,Ltd./OpenBlocks IX9 models with FW (FW5.0.x) all versions prior to FW5.0.8

Published Jan 06, 2026

Tracked Since Feb 18, 2026