CVE-2026-86426 Scanner

LibreNMS is an open-source network monitoring system used by organizations around the world to manage and monitor network devices. It provides comprehensive monitoring capabilities and is typically utilized by network administrators to ensure the health and performance of networks. LibreNMS integrates with a variety of devices and platforms, making it a versatile choice for monitoring. By using LibreNMS, users can receive alerts on network issues, monitor bandwidth usage, and track device health. It is a critical tool for IT departments seeking to maintain network reliability. LibreNMS has a wide user base, ranging from small businesses to large enterprises.

The vulnerability found in LibreNMS involves unauthenticated access to its API, which can occur due to a flaw in token validation. This critical issue allows attackers to bypass authentication mechanisms and gain access to restricted endpoints without proper credentials. The security weakness arises from MySQL type coercion exploited during REST API token validation processes. Exploiting this vulnerability could allow malicious users to execute remote code and compromise the network. Consequently, the vulnerability represents a significant security risk to organizations using vulnerable versions of LibreNMS. Understanding and addressing this gap is crucial for maintaining the integrity of network monitoring operations.

The unauthenticated API access vulnerability in LibreNMS is related to vulnerable endpoints in its REST API. The misuse arises from inadequate handling of API tokens, where the system fails to enforce strict authentication controls. Attackers can leverage this vulnerability by sending specially crafted requests to the API to execute undesirable actions. With type coercion in MySQL, the validation process can incorrectly authenticate malicious input as valid tokens. The endpoints most susceptible to this manipulation include those handling sensitive configuration and alert templates. Hence, the vulnerability's exploitation could lead to severe network and data exposure risks.

If the vulnerability is exploited, it can lead to a full system compromise. Malicious actors could execute arbitrary code, effectively gaining unauthorized control over the monitored network. This access can result in the theft or manipulation of sensitive network data, disruption of monitoring processes, and degradation of service reliability. Moreover, attackers could potentially deploy malware or launch further attacks on interconnected systems. The impact on network security and operations could be catastrophic, resulting in significant data loss and reputational damage for affected organizations.

REFERENCES

• https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg