{"id":"CVE-2026-21411","state":"PUBLISHED","title":"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.","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.","publishedAt":"2026-01-06T06:34:11.329Z","updatedAt":"2026-01-06T14:49:01.813Z","severity":{"score":8.7,"label":"High","version":"4.0","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","source":"jpcert"},"assigner":"jpcert","products":["Plat'Home Co.,Ltd. OpenBlocks IoT DX1 (FW5.0.x)","Plat'Home Co.,Ltd. OpenBlocks IoT EX/BX models (FW5.0.x)","Plat'Home Co.,Ltd. OpenBlocks IX9 models with FW (FW5.0.x)","Plat'Home Co.,Ltd. OpenBlocks IoT VX2 (FW5.0.x)","Plat'Home Co.,Ltd. OpenBlocks IDM RX1 (FW5.0.x)","Plat'Home Co.,Ltd. OpenBlocks IoT FX1 (FW5.0.x)"],"affected":[{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT DX1 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT EX/BX models (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IX9 models with FW (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT VX2 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IDM RX1 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT FX1 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]}],"references":["https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/","https://jvn.jp/en/vu/JVNVU97172240/"],"weaknesses":["CWE-288"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/21xxx/CVE-2026-21411.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21411","state":"PUBLISHED","datePublished":"2026-01-06T06:34:11.329Z","dateUpdated":"2026-01-06T14:49:01.813Z","assignerShortName":"jpcert","assignerOrgId":"ede6fdc4-6654-4307-a26d-3331c018e2ce","dateReserved":"2026-01-05T02:44:14.797Z"},"containers":{"cna":{"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."}],"affected":[{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT DX1 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT EX/BX models (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IX9 models with FW (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT VX2 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IDM RX1 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]},{"vendor":"Plat'Home Co.,Ltd.","product":"OpenBlocks IoT FX1 (FW5.0.x)","versions":[{"version":"all versions prior to FW5.0.8","status":"affected"}]}],"references":[{"url":"https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/"},{"url":"https://jvn.jp/en/vu/JVNVU97172240/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV3_0":{"version":"3.0","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV4_0":{"version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-288","description":"Authentication Bypass Using an Alternate Path or Channel","lang":"en-US","type":"CWE"}]}],"providerMetadata":{"shortName":"jpcert","orgId":"ede6fdc4-6654-4307-a26d-3331c018e2ce","dateUpdated":"2026-01-06T06:34:11.329Z"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-06T14:47:57.055920Z","id":"CVE-2026-21411","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-06T14:49:01.813Z"}}]}}}