EUVD-2026-31385
GHSA-3ggx-cv4j-6p7j
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Primary rating from Vendor (hackerone) · only source for this CVE.
CVSS VectorVendor: hackerone
Lifecycle Timeline
2DescriptionCVE.org
A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
AnalysisAI
Command injection in Ubiquiti UniFi OS devices allows a high-privileged attacker on the network to execute arbitrary operating system commands by abusing improperly validated input. The flaw carries a critical CVSS 9.1 score with scope change, indicating successful exploitation can break out of the originating security context, though no public exploit identified at time of analysis.
Technical ContextAI
The affected component is Ubiquiti's UniFi OS Server (per CPE cpe:2.3:a:ubiquiti_inc:unifi_os_server), the management platform that runs across Ubiquiti's UniFi gateway, controller, and Cloud Key appliances. CWE-20 (Improper Input Validation) is the root cause class: user-supplied input passed to an administrative function reaches an operating system command interpreter without adequate sanitization or allowlisting, enabling injection of shell metacharacters or additional commands. The scope-changed CVSS rating (S:C) indicates the command executes under a security context broader than the calling administrative interface, consistent with web/management code that shells out to underlying OS utilities running with elevated UniFi service privileges.
RemediationAI
Patch available per vendor advisory - consult Ubiquiti Security Advisory Bulletin 064 at https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b for the exact fixed UniFi OS version and apply the firmware update to all UniFi consoles in the environment. As compensating controls until patching is complete, restrict the UniFi OS management interface (typically HTTPS on the LAN/management VLAN) to a dedicated admin network using firewall ACLs so PR:H exploitation cannot be reached from general user segments; rotate any shared administrator credentials and ensure each admin has a unique account so a compromised credential can be revoked individually; and enable two-factor authentication on UniFi SSO admin accounts to raise the cost of credential-based pivot to the privileged role required by the bug. These controls reduce exploit reachability but do not remove the vulnerability and may interrupt remote-admin workflows for staff who previously managed UniFi from arbitrary networks.
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Command Injection
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External POC / Exploit Code
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