CVE-2026-1632: MOMA Seismic Station Auth Bypass Flaw

CVE-2026-1632 Overview

CVE-2026-1632 is a critical authentication bypass vulnerability affecting MOMA Seismic Station Version v2.4.2520 and prior releases. The vulnerability stems from the device exposing its web management interface without requiring authentication, classified as CWE-306 (Missing Authentication for Critical Function). This flaw allows unauthenticated remote attackers to access the management console and perform privileged operations including modifying configuration settings, acquiring sensitive device data, or remotely resetting the device.

Critical Impact

Unauthenticated remote attackers can fully compromise MOMA Seismic Station devices, gaining the ability to modify configurations, exfiltrate seismic monitoring data, and disrupt operations by remotely resetting devices.

Affected Products

• MOMA Seismic Station Version v2.4.2520
• MOMA Seismic Station all versions prior to v2.4.2520

Discovery Timeline

• 2026-02-03 - CVE-2026-1632 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2026-1632

Vulnerability Analysis

This vulnerability represents a fundamental authentication design flaw in the MOMA Seismic Station's web management interface. The device exposes administrative functionality over the network without implementing any form of authentication mechanism. This allows any network-adjacent or internet-connected attacker to interact with the management interface as if they were an authorized administrator.

The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function), which indicates that the application fails to perform any authentication when access to a critical resource or function is requested. In this case, the critical functions include device configuration management, data acquisition capabilities, and device reset functionality.

The network-based attack vector with no authentication requirements makes this vulnerability particularly severe for operational technology (OT) environments where seismic monitoring stations may be deployed. Successful exploitation could lead to data integrity issues affecting seismic monitoring accuracy, service disruptions through unauthorized device resets, or exfiltration of sensitive monitoring data.

Root Cause

The root cause of CVE-2026-1632 is the complete absence of authentication controls on the MOMA Seismic Station's web management interface. The device firmware fails to implement authentication checks before granting access to administrative functions, allowing any user who can reach the web interface to perform privileged operations. This represents a fundamental security architecture flaw where security-critical functionality is exposed without proper access controls.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication, no user interaction, and low attack complexity. An attacker can exploit this vulnerability by simply connecting to the MOMA Seismic Station's web management interface over the network. Once connected, the attacker gains immediate access to administrative functions without providing any credentials.

The exploitation path involves identifying an exposed MOMA Seismic Station device on the network, accessing the web management interface directly via HTTP/HTTPS, and then performing unauthorized actions such as modifying device configurations, downloading seismic data, or triggering device resets. For additional technical details, refer to the CISA ICS Advisory ICSA-26-034-03.

Detection Methods for CVE-2026-1632

Indicators of Compromise

• Unexpected configuration changes on MOMA Seismic Station devices without corresponding change records
• Anomalous network connections to the device's web management port from unauthorized IP addresses
• Device resets or service interruptions that cannot be attributed to legitimate administrative actions
• Evidence of data exfiltration or unusual outbound data transfers from seismic monitoring infrastructure

Detection Strategies

• Monitor network traffic for HTTP/HTTPS connections to MOMA Seismic Station management interfaces, particularly from external or unauthorized IP ranges
• Implement network segmentation monitoring to detect unauthorized access attempts to OT/ICS network segments
• Deploy intrusion detection system (IDS) rules to alert on access patterns consistent with web interface enumeration or exploitation
• Review device logs for administrative actions that do not correlate with authorized change management activities

Monitoring Recommendations

• Establish baseline network behavior for MOMA Seismic Station devices and alert on deviations
• Configure SIEM rules to correlate access attempts to seismic monitoring infrastructure with authorized user activities
• Implement continuous vulnerability scanning to identify exposed management interfaces on critical infrastructure devices
• Enable detailed logging on network devices to capture all traffic to and from affected seismic stations

How to Mitigate CVE-2026-1632

Immediate Actions Required

• Implement network segmentation to isolate MOMA Seismic Station devices from untrusted networks and the internet
• Deploy firewall rules to restrict access to device management interfaces to authorized IP addresses only
• Audit all MOMA Seismic Station devices in the environment to confirm firmware versions and exposure status
• Contact the vendor for information regarding firmware updates that address the authentication bypass

Patch Information

Organizations should consult the CISA ICS Advisory ICSA-26-034-03 for the latest remediation guidance and patch availability information. Monitor vendor communications for firmware updates that implement proper authentication controls for the web management interface.

Workarounds

• Place affected MOMA Seismic Station devices behind a VPN or jump server requiring authentication before network access is granted
• Implement network-level access controls using firewalls or access control lists (ACLs) to restrict management interface access to trusted administrator workstations
• Consider disabling the web management interface if not operationally required and manage devices through alternative methods
• Deploy network monitoring to detect and alert on any unauthorized access attempts to device management interfaces

# Example firewall rule to restrict management interface access (iptables)
# Replace 192.168.1.100 with actual device IP and 10.0.0.0/24 with authorized admin network
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 80 -j DROP
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 443 -j DROP