CVE-2026-105281 in openPDC
Summary
by MITRE • 10/09/2026
The internal data publisher on openPDC accepts network connections without authentication in its default configuration. An unauthenticated network attacker can connect to this interface and retrieve the complete device and measurement topology of the system.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability identified within the openPDC software stems from a critical misconfiguration in its internal data publisher component, which serves as an interface for distributing real-time phasor measurement unit (PMU) data to downstream applications or monitoring systems. In its default installation state, this service is configured to accept incoming network connections without requiring any form of authentication or access control verification. This design oversight effectively exposes a sensitive administrative and operational interface to the broader network environment, allowing any entity with network reachability to interact with the system directly. The absence of an authentication mechanism represents a fundamental failure in implementing secure defaults, which is contrary to established security best practices for industrial control systems and critical infrastructure components that handle high-value telemetry data.
From a technical perspective, this flaw allows unauthenticated actors to establish TCP connections to the specific port designated for the internal data publisher. Once connected, the attacker can query the system to retrieve comprehensive details regarding the device topology and measurement configurations. This includes sensitive information such as the arrangement of phasor concentrators, the identity and location of individual PMUs, communication protocols in use, and potentially calibration parameters or scaling factors associated with measurements. The exposure of this metadata is particularly dangerous because it provides a detailed map of the power grid's architecture to potential adversaries. Such intelligence can be leveraged for further reconnaissance activities, enabling attackers to identify high-value targets within the network infrastructure that may have weaker security postures compared to the central data publisher itself.
The operational impact of this vulnerability extends beyond mere information disclosure. By understanding the complete device and measurement topology, an attacker gains significant situational awareness necessary for planning more sophisticated attacks against the power grid or related industrial control systems. This knowledge facilitates targeted disruption efforts, such as identifying specific substations or generation facilities that are critical to grid stability but may lack robust perimeter defenses. Furthermore, in scenarios where the data publisher is integrated with other vulnerable services or if future updates introduce additional unauthenticated endpoints, this initial foothold could serve as a vector for lateral movement within the network. The exposure of measurement topology also aids in crafting sophisticated false data injection attacks, where an adversary might attempt to manipulate sensor readings by understanding exactly which devices feed into specific aggregators and how their data is processed, thereby increasing the likelihood that injected malicious data will be accepted without triggering anomaly detection systems.
This vulnerability aligns with several recognized industry standards for classifying security flaws. It corresponds directly to CWE-287, Improper Authentication, as the system fails to adequately verify the identity of users or services attempting to access resources. Additionally, it relates to CWE-200, Information Exposure, due to the disclosure of sensitive internal network structure and configuration details that should be restricted to authorized personnel only. In terms of offensive security frameworks, this scenario maps to MITRE ATT&CK technique T1592, Gather Victim Host Information, specifically through sub-techniques involving software discovery or system information collection via remote services. The lack of authentication also touches upon CWE-732, which pertains to the default configuration of components that are insecure by design if not explicitly hardened during deployment.
To mitigate this risk, immediate remediation steps should focus on enforcing strict access controls on the openPDC internal data publisher interface. Administrators must configure the service to require strong authentication mechanisms for all incoming connections, ensuring that only authorized monitoring stations or downstream applications can retrieve topology and measurement data. This may involve implementing mutual TLS (mTLS) where both parties verify each other's certificates, or integrating with existing enterprise identity providers using protocols such as OAuth2 or Kerberos depending on the deployment architecture. Network-level mitigations should also be employed by placing the openPDC server behind a firewall that restricts access to this specific port exclusively from trusted IP addresses associated with authorized monitoring systems. Regular security audits and configuration reviews are essential to ensure that default settings do not persist in production environments, adhering to the principle of least privilege where services operate only with the minimum permissions necessary for their function.