CVE-2026-22559 in UniFi Network Server
Summary
by MITRE • 03/24/2026
An Improper Input Validation vulnerability in UniFi Network Server may allow unauthorized access to an account if the account owner is socially engineered into clicking a malicious link.
Affected Products: UniFi Network Server (Version 10.1.85 and earlier)
Mitigation: Update UniFi Network Server to Version 10.1.89 or later.
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Analysis
by VulDB Data Team • 03/29/2026
The vulnerability identified as CVE-2026-22559 represents a critical weakness in the UniFi Network Server authentication mechanism that stems from inadequate input validation during account recovery processes. This flaw specifically affects versions 10.1.85 and earlier, creating a pathway for attackers to exploit social engineering tactics to gain unauthorized access to user accounts. The vulnerability operates through a sophisticated attack vector that leverages the trust relationship between the system and its users, making it particularly dangerous in environments where social engineering campaigns are prevalent. The improper validation occurs during the account recovery workflow, where the system fails to adequately verify the legitimacy of requests originating from potentially compromised user sessions.
The technical implementation of this vulnerability falls under CWE-20, which categorizes improper input validation as a fundamental security weakness that allows malicious data to bypass validation controls. Attackers can craft malicious links that exploit the lack of proper validation in the account recovery mechanism, potentially enabling them to reset passwords or gain access to user accounts without proper authorization. This weakness creates a direct pathway for privilege escalation and unauthorized access to sensitive network resources. The vulnerability demonstrates a classic example of how insufficient validation controls can be exploited in authentication flows, particularly when user interaction is required for account recovery operations.
From an operational perspective, this vulnerability presents significant risk to organizations relying on UniFi Network Server for their network infrastructure management. The attack requires social engineering to convince users to click malicious links, but once successful, it can lead to complete compromise of user accounts and potentially the entire network infrastructure. The impact extends beyond individual account compromise to include potential data exfiltration, network disruption, and unauthorized access to critical network resources. Organizations using affected versions face a substantial risk of unauthorized access to their network management systems, which could result in service disruption, data breaches, and compliance violations. The vulnerability's exploitation does not require advanced technical skills beyond basic social engineering and link crafting capabilities.
The recommended mitigation strategy involves updating UniFi Network Server to version 10.1.89 or later, which includes patches addressing the input validation weaknesses in the account recovery process. This update implements proper validation controls that verify the authenticity of recovery requests and prevent exploitation of the vulnerability. Organizations should prioritize this update as a critical security measure, implementing it across all affected systems immediately. Additionally, network administrators should consider implementing additional security controls such as multi-factor authentication, enhanced monitoring of account recovery activities, and user education programs to reduce the effectiveness of social engineering attacks. The mitigation aligns with ATT&CK framework tactics related to credential access and privilege escalation, emphasizing the importance of patch management and authentication security controls in preventing such vulnerabilities from being exploited in real-world scenarios.