CVE-2026-3558 in Hue Bridge
Summary
by MITRE • 03/16/2026
Philips Hue Bridge HomeKit Accessory Protocol Transient Pairing Mode Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of Philips Hue Bridge. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the configuration of the HomeKit Accessory Protocol service, which listens on TCP port 8080 by default. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-28374.
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Analysis
by VulDB Data Team • 06/04/2026
The Philips Hue Bridge represents a widely deployed smart home ecosystem that integrates with Apple's HomeKit platform through the HomeKit Accessory Protocol HAP. This vulnerability resides within the bridge's implementation of HAP service configuration, specifically affecting the transient pairing mode functionality that enables temporary access to the device's management interface. The affected system operates with a default listening configuration on TCP port 8080, which serves as the primary communication channel for HomeKit accessory operations and device management functions. Security researchers identified this weakness through network analysis of the bridge's protocol implementation, revealing that the transient pairing mode fails to enforce proper authentication mechanisms before granting access to sensitive operational functions.
The technical flaw manifests as a critical authentication bypass vulnerability within the HomeKit Accessory Protocol implementation where the system does not require valid credentials before allowing access to administrative functions. This occurs during the transient pairing mode operation, which is designed to temporarily grant access to devices within the HomeKit ecosystem without requiring permanent authentication. The vulnerability stems from improper state management within the HAP service configuration, where the system fails to validate user credentials or session tokens before permitting access to the bridge's management interface. This weakness exists because the implementation does not properly enforce the authentication requirements that should normally be mandatory for accessing device configuration and control functions, allowing any network-adjacent attacker to gain unauthorized access to the system's administrative capabilities.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete compromise of the Philips Hue Bridge's management interface. Network-adjacent attackers can exploit this weakness to gain full administrative control over the device, potentially enabling them to modify device settings, access stored credentials, manipulate smart home automation rules, and control all connected lighting fixtures within the network. The vulnerability affects the fundamental security model of the HomeKit ecosystem, as it undermines the trust relationship between the device and authorized users. The lack of authentication requirements means that attackers can perform operations such as adding new accessories, modifying existing configurations, and potentially creating persistent backdoors within the smart home network. This represents a significant risk to user privacy and security, particularly in residential environments where smart home devices are increasingly integrated into daily life and connected to broader internet infrastructure.
Mitigation strategies for this vulnerability should focus on immediate network segmentation and access control measures to prevent unauthorized network-adjacent access to the Philips Hue Bridge. Organizations and individuals should implement strict network boundary controls, including firewall rules that restrict access to TCP port 8080 and other relevant ports used by the HAP service. The most effective immediate solution involves disabling the HomeKit Accessory Protocol service when it is not actively required, or implementing network access controls that limit access to trusted devices only. Security best practices recommend applying the latest firmware updates from Philips, which typically address authentication bypass vulnerabilities through proper credential validation mechanisms. The vulnerability aligns with CWE-287 which addresses improper authentication issues, and it maps to ATT&CK technique T1078.004 for valid accounts and T1566.002 for spearphishing via social media, as attackers may exploit this weakness through network reconnaissance and targeted attacks. Additionally, network administrators should consider implementing intrusion detection systems to monitor for unauthorized access attempts to the affected service ports, and establish regular security audits to identify and remediate similar configuration weaknesses in other smart home devices and IoT infrastructure components.