CVE-2026-21411

Jan. 6, 2026, 7:15 a.m.

8.7
High

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.

Product(s) Impacted

Vendor Product Versions
Open Blocks
  • Open Blocks
  • <5.0.8

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-288
Authentication Bypass Using an Alternate Path or Channel
A product requires authentication, but the product has an alternate path or channel that does not require authentication.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a open_blocks open_blocks <5.0.8 / / / / / / /

References

https://jvn.jp/en/vu/JVNVU97172240/
https://www.plathome.co.jp/support/software/fw5/dx1-v5-0-8/

Tags

vultures@jpcert.or.jp
CWE-288
2026-01-06
CVE-2026-21411

CVSS Score

8.7 / 10

CVSS Data - 4.0

  • Attack Vector: ADJACENT
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: HIGH
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: Jan. 6, 2026, 7:15 a.m.
Last Modified: Jan. 6, 2026, 7:15 a.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

vultures@jpcert.or.jp

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.