CVE-2026-77097 in Cloud
Summary
by MITRE • 09/08/2026
Private Metrics Server contained a missing authentication condition affecting metrics upload functionality and service availability. Software customers upgrade to resolved maintenance release. Update Private Metrics Server.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified in the Private Metrics Server involves a critical failure in access control mechanisms, specifically manifesting as a missing authentication check within the metrics upload functionality. This security flaw allows unauthenticated actors to interact with endpoints intended for authorized system components or administrative users who are responsible for ingesting operational data into the monitoring infrastructure. In typical enterprise environments, metrics servers aggregate telemetry data from various applications and services to provide visibility into system health, performance bottlenecks, and resource utilization. By bypassing authentication requirements on these upload interfaces, an attacker gains the ability to inject arbitrary or malformed metric data directly into the server without valid credentials. This represents a significant deviation from standard security practices where all write operations to sensitive infrastructure components must be strictly authenticated and authorized to prevent unauthorized modifications or injections.
From a technical perspective, this flaw aligns with CWE-306, which describes missing authentication for critical function, as well as CWE-287, involving improper authentication checks that allow attackers to bypass security controls. The absence of these checks means the server trusts incoming requests based on their destination rather than verifying the identity or permissions of the sender. This oversight creates a direct pathway for exploitation where malicious actors can manipulate the data stream processed by the metrics engine. Such manipulation is not merely theoretical; it has tangible consequences for system integrity and operational continuity, as the downstream systems relying on this data may make incorrect decisions based on poisoned inputs.
The operational impact of this vulnerability extends beyond simple data corruption to include severe service availability risks. An attacker can exploit the unauthenticated upload endpoint to flood the server with excessive or malformed metric entries, effectively triggering a denial-of-service condition through resource exhaustion. This type of attack consumes CPU cycles, memory, and disk I/O as the system attempts to process and store invalid or voluminous data streams. Furthermore, if the metrics ingestion pipeline is integrated with alerting systems or automated scaling mechanisms, injected malicious metrics could trigger false alarms or inappropriate auto-scaling events, leading to cascading failures across dependent services. The integrity of monitoring dashboards is also compromised, potentially obscuring real security incidents or performance issues by flooding them with noise from fake metrics.
In the context of cyber offense frameworks such as MITRE ATT&CK, this vulnerability facilitates techniques related to resource hijacking and impact via denial of service. It allows an adversary to disrupt business operations without needing prior access credentials, lowering the barrier for entry significantly compared to attacks requiring compromised accounts. The ability to inject data also opens avenues for long-term persistence or lateral movement if the metrics server is trusted by other internal systems that parse its output for configuration changes or health checks. Therefore, treating this as a high-severity issue is warranted due to its potential to disrupt critical monitoring capabilities and degrade overall system stability.
To mitigate these risks, organizations must immediately apply the resolved maintenance release provided by the software vendor, which patches the missing authentication logic in the metrics upload module. This update ensures that all requests targeting sensitive ingestion endpoints are validated against a robust identity provider or internal service mesh before processing occurs. In addition to applying the patch, administrators should implement network-level controls such as firewall rules or API gateways that restrict access to these specific ports and paths to known IP ranges associated with legitimate monitoring agents. Regular security audits of configuration files and endpoint definitions should be conducted to ensure no other services are exposed without proper authentication mechanisms. Continuous monitoring for anomalous traffic patterns, particularly spikes in metric ingestion volume from unknown sources, can provide early detection indicators while the patching process is underway across the infrastructure.