Ubiquiti UniFi OS Server access control

Summaryinfo

A vulnerability was found in Ubiquiti UniFi OS Server, Cloud Keys, Network Video Recorders, Enterprise Network Video Recorders, Enterprise Network Attached Storage, Dream Machines, Enterprise Firewall Core, Dream Routers, Enterprise Fortress Gateway, Cloud Gateways, Dream Wall, Express 7 and Network Attached Storage and classified as very critical. This vulnerability affects unknown code. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2026-77534. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Ubiquiti UniFi OS Server, Cloud Keys, Network Video Recorders, Enterprise Network Video Recorders, Enterprise Network Attached Storage, Dream Machines, Enterprise Firewall Core, Dream Routers, Enterprise Fortress Gateway, Cloud Gateways, Dream Wall, Express 7 and Network Attached Storage. It has been declared as very critical. This vulnerability affects an unknown code. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A malicious actor with access to the network and low privileges could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to escalate privileges within such UniFi OS devices or instances.

The advisory is shared for download at community.ui.com. This vulnerability was named CVE-2026-77534 since 08/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/26/2026). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3028). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Ubiquiti UniFi

Productinfo

Type

• Network Attached Storage Software

Vendor

• Ubiquiti

Name

• Cloud Gateways
• Cloud Keys
• Dream Machines
• Dream Routers
• Dream Wall
• Enterprise Firewall Core
• Enterprise Fortress Gateway
• Enterprise Network Attached Storage
• Enterprise Network Video Recorders
• Express 7
• Network Attached Storage
• Network Video Recorders
• UniFi OS Server

License

• commercial

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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