CVE-2026-77534: CWE-284 Improper Access Control - Generic in Ubiquiti Inc UniFi OS Server
Description
CVE-2026-77534 is a critical Improper Access Control vulnerability in Ubiquiti Inc's UniFi OS Server. It allows a malicious actor with network access and low privileges to escalate their privileges within affected UniFi OS devices or instances. The vulnerability has a very high CVSS score of 9.9, indicating severe impact on confidentiality, integrity, and availability. No specific affected versions or patches have been disclosed yet. There are no known exploits in the wild at this time.
CVSS v3.1
Score 9.9critical
Affected software
Ubiquiti Inc
UniFi OS Server
Ubiquiti Inc
Cloud Keys
Ubiquiti Inc
Network Video Recorders
Ubiquiti Inc
Enterprise Network Video Recorders
Ubiquiti Inc
Enterprise Network Attached Storage
Ubiquiti Inc
Dream Machines
Ubiquiti Inc
Enterprise Firewall Core
Ubiquiti Inc
Dream Routers
Ubiquiti Inc
Enterprise Fortress Gateway
Ubiquiti Inc
Cloud Gateways
Ubiquiti Inc
Dream Wall
Ubiquiti Inc
Express 7
Ubiquiti Inc
Network Attached Storage
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-77534) involves improper access control (CWE-284) in UniFi OS Server by Ubiquiti Inc. An attacker with network access and low privileges can exploit this flaw to escalate privileges within the UniFi OS environment. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) reflects that the attack can be performed remotely over the network with low attack complexity and privileges, no user interaction is required, and it results in complete compromise of confidentiality, integrity, and availability. The vulnerability is published but no remediation level or patch information is currently available. The affected versions are not explicitly stated.
Potential Impact
Successful exploitation allows an attacker with low privileges on the network to escalate their privileges within UniFi OS devices, potentially leading to full system compromise including complete loss of confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict network access to UniFi OS devices to trusted users only and monitor for suspicious activity related to privilege escalation attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Ubiquiti
- Date Reserved
- 2026-08-20T20:32:30.112Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8eb3e2acd9273b49ac7730
Added to database: 08/26/2026, 09:37:38 UTC
Last enriched: 09/09/2026, 19:22:15 UTC
Last updated: 10/08/2026, 18:48:48 UTC
Views: 96
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