Guest-to-Administrator escalation via overprivileged Matter ICAC
Published Sep 16, 2025 · Updated Sep 16, 2025
Privilege escalation in Tuya Smart Life App 5.6.1 allows remote authenticated users to gain full control of Matter devices. The Tuya cloud's thing.m.matter.icac.issue API signs a guest-generated key, and the device ACL assigns the resulting controller level 5 Administrator access. An owner must first invite the attacker as a low-privilege guest; the guest can then install the ICAC in another controller, alter device ACLs, and retain control after removal from the home.
Summary
What happened
Privilege escalation in Tuya Smart Life App 5.6.1 allows remote authenticated users to gain full control of Matter devices. The Tuya cloud's thing.m.matter.icac.issue API signs a guest-generated key, and the device ACL assigns the resulting controller level 5 Administrator access. An owner must first invite the attacker as a low-privilege guest; the guest can then install the ICAC in another controller, alter device ACLs, and retain control after removal from the home.
The record
- CVE
- CVE-2025-56557
- Published
- Sep 16, 2025
- Updated
- Sep 16, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-250, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 16, 2025CVE publishedPublication date reported by the CVE source.
- Sep 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Public exploit references
- CHIP Tool ICAC privilege-escalation proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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