CVE-2026-0789: ALGO 8180 Information Disclosure Flaw

CVE-2026-0789 Overview

CVE-2026-0789 is an information disclosure vulnerability affecting the ALGO 8180 IP Audio Alerter devices. The vulnerability exists within the web-based user interface and allows remote attackers to disclose sensitive information without requiring authentication. The specific flaw results from improper management of sensitive information, where the authentication cookie is included in the HTTP response body.

Critical Impact

Unauthenticated remote attackers can exploit this vulnerability to obtain authentication credentials, potentially enabling further attacks against affected ALGO 8180 IP Audio Alerter devices.

Affected Products

• ALGO 8180 IP Audio Alerter devices
• ALGO 8180 Web-based User Interface

Discovery Timeline

• 2026-01-23 - CVE CVE-2026-0789 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-0789

Vulnerability Analysis

This vulnerability (tracked as ZDI-CAN-28297) represents an information leakage condition in the ALGO 8180 IP Audio Alerter's web-based management interface. The flaw enables unauthenticated attackers to extract sensitive authentication data by simply making requests to the device's web interface over the network.

The vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating that the device fails to properly protect authentication credentials during HTTP communications. When the web UI generates responses, it improperly includes the authentication cookie within the response body, making it accessible to any remote attacker who can reach the device over the network.

Root Cause

The root cause lies in improper handling of sensitive authentication data within the web-based user interface. The application fails to follow secure coding practices for credential management, resulting in authentication cookies being exposed in HTTP response bodies where they can be intercepted by unauthorized parties.

Attack Vector

The attack can be executed remotely over the network without any authentication or user interaction required. An attacker with network access to an affected ALGO 8180 device can send crafted HTTP requests to the web interface and extract authentication cookies from the response body.

The vulnerability mechanism involves the web UI inadvertently including session or authentication cookie values in the HTTP response content. This allows an unauthenticated attacker to harvest these credentials and potentially use them to authenticate to the device, gaining unauthorized access to administrative functions.

For detailed technical analysis, refer to the Zero Day Initiative Advisory ZDI-26-011.

Detection Methods for CVE-2026-0789

Indicators of Compromise

• Unusual HTTP requests targeting the ALGO 8180 web interface from external or unauthorized IP addresses
• Repeated requests to specific endpoints that return authentication cookie data
• Evidence of credential extraction or session hijacking attempts in web server logs
• Unauthorized administrative access to ALGO 8180 devices following reconnaissance activity

Detection Strategies

• Monitor network traffic for unauthenticated requests to ALGO 8180 web interfaces
• Implement intrusion detection rules to identify HTTP responses containing authentication tokens in the body
• Review web server access logs for suspicious patterns targeting the management interface
• Deploy network segmentation monitoring to detect attempts to reach IoT devices from untrusted networks

Monitoring Recommendations

• Isolate ALGO 8180 devices on a dedicated VLAN with restricted access
• Enable logging on the device's web interface and forward logs to a SIEM for analysis
• Implement network-based anomaly detection for IoT device communication patterns
• Monitor for authentication events that do not match expected administrator activity

How to Mitigate CVE-2026-0789

Immediate Actions Required

• Restrict network access to ALGO 8180 devices to trusted administrative networks only
• Implement firewall rules to block external access to the web management interface
• Place affected devices behind a VPN or secure gateway for remote management access
• Review device logs for any signs of prior exploitation or unauthorized access

Patch Information

At the time of publication, no vendor patch information is available. Organizations should monitor the Zero Day Initiative Advisory ZDI-26-011 for updates regarding vendor response and patch availability. Contact ALGO directly for firmware update guidance.

Workarounds

• Disable the web-based management interface if not required for operations
• Implement network segmentation to isolate affected devices from untrusted networks
• Use a reverse proxy with authentication to protect access to the web interface
• Consider temporarily taking affected devices offline until a patch is available

# Example network segmentation using iptables to restrict access
# Allow only trusted admin subnet (192.168.10.0/24) to access device web UI
iptables -A INPUT -p tcp --dport 80 -s 192.168.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP