CVE-2026-79669 in Ech0
Summary
by MITRE • 08/25/2026
Ech0 before 4.4.3 lacks authorization checks on system log endpoints allowing any authenticated non-admin user to read and stream all server logs. Attackers can access historical logs and real-time log streams via GET /api/system/logs, GET /api/system/logs/stream, and WS /ws/system/logs to gather reconnaissance data including internal file paths, error stack traces, and application state.
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Analysis
by VulDB Data Team • 08/25/2026
The vulnerability identified in Ech0 versions prior to 4.4.3 represents a critical failure in access control mechanisms within the system's logging subsystem. Specifically, the endpoints responsible for serving server logs lack proper authorization checks that distinguish between administrative privileges and standard user permissions. This architectural flaw allows any authenticated non-administrator user to bypass intended restrictions and interact with sensitive log data through multiple interface vectors including HTTP GET requests to /api/system/logs and /api/system/logs/stream as well as WebSocket connections via WS /ws/system/logs. The absence of these checks effectively exposes internal operational details that should remain restricted to system administrators or security operations personnel who require such information for legitimate maintenance and incident response activities.
From a technical perspective, the flaw constitutes an insecure direct object reference combined with broken access control where the application fails to verify whether the requesting user possesses the necessary role-based permissions before serving log content. This allows attackers to retrieve historical logs which may contain sensitive configuration details database credentials or proprietary code snippets embedded in error messages as well as real-time streams that reveal current system state and active processes. The ability to stream logs continuously enables persistent monitoring of application behavior potentially exposing new vulnerabilities or security events as they occur without detection by standard intrusion prevention systems designed for higher privilege levels.
The operational impact of this vulnerability is significant as it facilitates extensive reconnaissance activities against the target infrastructure. Attackers can extract internal file paths which may reveal directory structures and deployment configurations error stack traces that expose framework versions library dependencies and potential injection points or other code-level weaknesses and application state information including session tokens active user sessions and temporary data stored in memory. This intelligence gathering phase is often a precursor to more severe attacks such as privilege escalation remote code execution or targeted credential theft making the exploitation of this vulnerability particularly dangerous even if it does not directly compromise confidentiality integrity or availability on its own.
This issue aligns with CWE-284 Improper Access Control and CWE-538 Insertion of Sensitive Information into Log File depending on whether the primary concern is unauthorized access to existing logs or the exposure of sensitive data within those logs respectively in terms of MITRE ATT&CK framework it maps to T1078 Valid Accounts as exploitation requires valid authentication credentials but leverages insufficient privilege separation and potentially T1592 Gather Victim Host Information through log analysis. To mitigate this risk organizations should immediately upgrade Ech0 to version 4.4.3 or later where these authorization checks have been implemented correctly ensuring that only users with explicit administrative roles can access system logs via API endpoints or WebSocket connections additionally implementing principle of least privilege across all application services and conducting regular security audits focused on role-based access control configurations will help prevent similar vulnerabilities in other subsystems.