CVE-2026-77536: CWE-284 Improper Access Control - Generic in Ubiquiti Inc UniFi OS Server
Description
CVE-2026-77536 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 CVSS score of 9.9, indicating a high severity with potential complete compromise of confidentiality, integrity, and availability. No specific affected versions or patches have been disclosed yet, and no known exploits are reported in the wild.
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-2026-77536) 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 base score is 9.9, reflecting network attack vector, low attack complexity, no user interaction, and a scope change with high impact on confidentiality, integrity, and availability. No remediation level or patch information is currently available, and the vulnerability is not related to a cloud service.
Potential Impact
Successful exploitation could allow an attacker with limited network access and low privileges to gain elevated privileges on UniFi OS devices, potentially leading to full system compromise including confidentiality, integrity, and availability impacts.
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 unusual privilege escalations.
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: 6a8eb76eacd9273b49b07eb5
Added to database: 08/26/2026, 09:52:46 UTC
Last enriched: 09/09/2026, 19:07:39 UTC
Last updated: 10/09/2026, 18:48:23 UTC
Views: 71
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