CVE-2026-77541: UniFi Network Application Privilege Escalation

CVE-2026-77541 Overview

CVE-2026-77541 is an Improper Access Control vulnerability [CWE-284] in the Ubiquiti UniFi Network Application. An authenticated attacker with network access and high privileges can escalate privileges within the application. The flaw carries a network attack vector with a scope change, meaning successful exploitation can affect components beyond the vulnerable application boundary. Ubiquiti disclosed the issue in Security Advisory Bulletin 067.

Critical Impact
An authenticated high-privileged user on the network can escalate privileges within UniFi Network Application, compromising confidentiality, integrity, and availability of managed network infrastructure.

Affected Products

Ubiquiti UniFi Network Application
Deployments managing UniFi access points, switches, and gateways
Self-hosted and UniFi Cloud Console instances running vulnerable versions

Discovery Timeline

2026-08-26 - CVE-2026-77541 published to NVD
2026-08-26 - Last updated in NVD database
Ubiquiti Security Advisory Bulletin 067 - Vendor advisory published (Ubiquiti Security Advisory Bulletin 067)

Technical Details for CVE-2026-77541

Vulnerability Analysis

CVE-2026-77541 stems from improper access control logic inside the UniFi Network Application. The application fails to correctly enforce role or permission boundaries for certain privileged operations. An attacker who already holds a high-privileged account can invoke functionality or reach resources reserved for a superior authorization level.

Because the CVSS scope is changed, the vulnerable component grants access to resources managed by a separate security authority. In UniFi deployments, this typically translates to control over additional sites, tenants, or underlying network devices adopted by the controller. Successful exploitation yields high impact to confidentiality, integrity, and availability of the network management plane.

Root Cause

The root cause is a missing or inadequate authorization check on privileged code paths, mapped to CWE-284 (Improper Access Control). The application likely relies on client-supplied context or partial server-side validation when evaluating whether a caller may perform administrative actions. Ubiquiti has not published root-cause source-level detail beyond the advisory summary.

Attack Vector

Exploitation requires network reachability to the UniFi Network Application and prior authentication as a high-privileged user. No user interaction is required. An attacker with a compromised administrator or elevated operator credential invokes affected API endpoints or management workflows to obtain privileges beyond their assigned role. The vulnerability cannot be triggered by unauthenticated actors.

No verified proof-of-concept code has been published. Ubiquiti has not reported exploitation in the wild, and CVE-2026-77541 is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Ubiquiti Security Advisory Bulletin 067 for vendor technical details.

Detection Methods for CVE-2026-77541

Indicators of Compromise

Unexpected administrator or superadmin role assignments in UniFi Network Application audit logs
API calls from privileged accounts targeting endpoints outside their normal operational scope
New site adoption, device provisioning, or configuration exports initiated by accounts that historically only performed read or limited-write actions
Session activity from privileged accounts originating from unusual source IP addresses or times

Detection Strategies

Review UniFi Network Application audit logs for privilege changes, role modifications, and administrative actions correlated with each account
Baseline normal API usage per administrator and alert on deviations that touch sensitive endpoints such as user management or site configuration
Correlate authentication events with subsequent privileged operations to identify escalation patterns following a valid login

Monitoring Recommendations

Forward UniFi Network Application logs to a centralized SIEM or data lake for retention and correlation
Monitor changes to administrator groups, RADIUS profiles, and site permissions in near real time
Alert on configuration exports, backup downloads, or device adoption events performed by non-owner accounts

How to Mitigate CVE-2026-77541

Immediate Actions Required

Upgrade the UniFi Network Application to the fixed version listed in Ubiquiti Security Advisory Bulletin 067
Rotate credentials for all administrator and operator accounts on the controller
Restrict network access to the UniFi Network Application management interface to trusted administrative networks and VPN endpoints
Review current role assignments and remove standing high-privilege access that is not operationally required

Patch Information

Ubiquiti has released a fixed version of the UniFi Network Application. Refer to the Ubiquiti Security Advisory Bulletin 067 for the specific patched release and upgrade instructions applicable to self-hosted controllers and UniFi Cloud Console deployments.

Workarounds

Enforce multi-factor authentication for every account with administrative privileges on the controller
Segment the UniFi Network Application onto a dedicated management VLAN reachable only from jump hosts
Apply least-privilege role assignments and remove unused administrator accounts pending the upgrade
Enable and regularly review audit logging to detect anomalous privileged activity

bash

# Configuration example
# Restrict management access to the UniFi Network Application (example iptables rules)
iptables -A INPUT -p tcp --dport 8443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8443 -j DROP
iptables -A INPUT -p tcp --dport 8080 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP