Administrator takeover via undisclosed authentication bypass
Published Jan 6, 2026 · Updated Jan 6, 2026
Authentication bypass in Plat'Home OpenBlocks series before FW5.0.8 allows attackers to change the administrator password via an adjacent network. The flaw lies in the FW5 Web UI authentication path, but the vendor has not disclosed which alternate request or channel skips the administrator check. No credentials or user interaction are required from the adjacent network, and successful exploitation gives control of the administrator password.
Summary
What happened
Authentication bypass in Plat'Home OpenBlocks series before FW5.0.8 allows attackers to change the administrator password via an adjacent network. The flaw lies in the FW5 Web UI authentication path, but the vendor has not disclosed which alternate request or channel skips the administrator check. No credentials or user interaction are required from the adjacent network, and successful exploitation gives control of the administrator password.
The record
- CVE
- CVE-2026-21411
- Published
- Jan 6, 2026
- Updated
- Jan 6, 2026
- Vendor
- Plat'Home Co., Ltd.
- Product
- OpenBlocks IoT DX1
- Classifications
- CWE-288, T1098
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 6, 2026CVE publishedPublication date reported by the CVE source.
- Jan 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=all versions prior to FW5.0.8
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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