CVE-2026-4476 Overview
A missing authentication vulnerability has been discovered in Yi Technology YI Home Camera 2 firmware version 2.1.1_20171024151200. The vulnerability exists within the CGI endpoint located at /home/web/ipc, where an unknown function fails to properly authenticate requests. This authentication bypass allows attackers with adjacent network access to interact with the camera's web interface without proper authorization, potentially compromising device confidentiality, integrity, and availability.
Critical Impact
Attackers on the local network can bypass authentication to access the YI Home Camera 2's CGI endpoint, potentially allowing unauthorized access to camera functionality and sensitive data.
Affected Products
- Yi Technology YI Home Camera 2 firmware version 2.1.1_20171024151200
Discovery Timeline
- 2026-03-20 - CVE CVE-2026-4476 published to NVD
- 2026-03-20 - Last updated in NVD database
Technical Details for CVE-2026-4476
Vulnerability Analysis
This vulnerability is classified under CWE-287 (Improper Authentication), indicating that the affected component fails to properly verify that users are who they claim to be. The CGI endpoint at /home/web/ipc processes requests without enforcing authentication checks, allowing any user with access to the adjacent network to interact with camera functions that should be restricted to authenticated administrators only.
The attack requires the adversary to be on the same local network as the vulnerable camera, limiting the attack surface to internal network threats or compromised network devices. However, once an attacker has adjacent network access, exploitation requires no privileges, no user interaction, and involves low attack complexity.
Root Cause
The root cause of this vulnerability stems from missing authentication controls in the CGI endpoint handler. The function responsible for processing requests to /home/web/ipc fails to validate user credentials or session tokens before executing privileged operations. This is a common oversight in IoT device firmware where web interfaces are deployed without proper access control mechanisms.
Attack Vector
The attack vector for CVE-2026-4476 requires adjacent network access, meaning the attacker must be positioned on the same network segment as the target camera. This could be achieved through:
- Physical access to the local network
- Compromising another device on the same network
- Connecting to a shared wireless network
Once positioned on the adjacent network, the attacker can send unauthenticated HTTP requests directly to the camera's CGI endpoint. The exploit has been publicly disclosed, increasing the likelihood of exploitation in the wild. The vendor was contacted about this vulnerability but did not respond, leaving users without an official patch.
The vulnerability allows manipulation of camera functions through the unauthenticated endpoint, potentially enabling attackers to view camera feeds, modify settings, or disrupt device operation. Technical details are available through the VulDB entry.
Detection Methods for CVE-2026-4476
Indicators of Compromise
- Unusual HTTP requests to /home/web/ipc endpoint from unexpected source IP addresses within the local network
- Multiple rapid authentication-free requests to the camera's CGI interface
- Network traffic anomalies indicating unauthorized access to camera endpoints
Detection Strategies
- Deploy network intrusion detection systems (NIDS) to monitor traffic to IoT devices and flag suspicious CGI endpoint access
- Implement network segmentation to isolate IoT cameras and monitor cross-segment traffic
- Configure network monitoring to alert on direct HTTP requests to camera IP addresses from non-administrative hosts
Monitoring Recommendations
- Enable logging on network firewalls and switches to capture traffic to and from IoT camera devices
- Establish baseline network behavior for camera devices and alert on deviations
- Regularly audit network access logs for unauthorized access attempts to camera management interfaces
How to Mitigate CVE-2026-4476
Immediate Actions Required
- Isolate affected Yi Technology YI Home Camera 2 devices on a separate network segment with restricted access
- Implement firewall rules to limit access to the camera's web interface to trusted administrative hosts only
- Monitor for suspicious network activity targeting camera endpoints
- Consider disabling or disconnecting affected devices until a patch becomes available
Patch Information
No official patch is currently available. The vendor was contacted about this vulnerability but did not respond. Users should monitor Yi Technology's official channels for firmware updates and apply any security patches as soon as they become available. Additional technical information can be found through the VulDB submission.
Workarounds
- Place affected cameras behind a dedicated VLAN with strict access controls to limit exposure
- Configure network firewall rules to block external access to camera web interfaces
- Use a VPN for remote camera access rather than exposing the device directly
- Consider replacing affected devices with alternatives that provide proper authentication mechanisms
# Example: Isolate camera on a separate VLAN (network switch configuration)
# Create dedicated IoT VLAN and restrict inter-VLAN routing
vlan 100
name IOT_CAMERAS
interface GigabitEthernet0/1
switchport access vlan 100
# Apply ACL to restrict access to camera management interface
ip access-list extended CAMERA_RESTRICT
permit tcp host 192.168.1.10 host 192.168.100.50 eq 80
deny tcp any host 192.168.100.50 eq 80
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
