CVE-2026-79666 in Ech0
Summary
by MITRE • 08/25/2026
Ech0 before 4.4.3 fails to enforce administrator authorization on dashboard log endpoints, allowing any authenticated user to access system logs. Attackers with valid user sessions can query GET /api/system/logs and subscribe to SSE and WebSocket log streams to retrieve sensitive operational data including file paths, stack traces, and internal URLs.
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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 application's dashboard logging subsystem. Specifically, the endpoints responsible for serving system logs lack proper authorization checks that restrict access to administrative roles only. This flaw allows any authenticated user, regardless of their privilege level or role assignment, to interact with these sensitive interfaces. The core technical issue lies in the absence of server-side validation when processing requests directed at log retrieval and streaming services, effectively bypassing intended security boundaries designed to protect operational intelligence from lower-privileged accounts.
The attack vector exploits standard HTTP GET methods as well as Server-Sent Events (SSE) and WebSocket connections targeting the /api/system/logs endpoint. By establishing a valid session with any authenticated account, an attacker can query this API directly or subscribe to real-time log streams. This capability transforms what should be an internal administrative tool into a publicly accessible data source for all logged-in users. The lack of role-based access control (RBAC) enforcement means that the application fails to distinguish between standard user requests and privileged administrator operations, leading to unauthorized information disclosure.
The operational impact of this vulnerability is significant due to the sensitivity of the data exposed through these log endpoints. System logs typically contain detailed technical artifacts such as absolute file paths on the server filesystem, stack traces from unhandled exceptions, internal URL structures, database query details, and potentially authentication tokens or session identifiers embedded in error messages. The exposure of file paths can aid attackers in mapping the underlying operating system structure for further exploitation attempts like path traversal or local file inclusion attacks. Stack traces reveal implementation specifics that may expose third-party library versions with known vulnerabilities or custom code logic flaws. Internal URLs provide insight into the network topology and service architecture, facilitating reconnaissance for more targeted lateral movement or API abuse scenarios.
This vulnerability aligns closely with CWE-284 Improper Access Control, as it involves a failure to enforce proper authorization policies on sensitive resources. Additionally, it relates to CWE-209 Generation of Error Message Containing Sensitive Information, since the logs often contain debug-level details that should not be exposed in production environments. From an offensive security perspective, this behavior is consistent with ATT&CK technique T1504.003 Web Session Cookie Manipulation if session hijacking precedes access, but more directly maps to T1078 Valid Accounts and T1213 Data from Information Repositories, as the attacker leverages valid credentials to extract structured data from internal systems for intelligence gathering purposes.
Mitigation strategies must prioritize immediate patching of Ech0 to version 4.4.3 or later where these authorization checks have been implemented correctly. In addition to upgrading, administrators should implement strict role-based access control policies that explicitly restrict log viewing capabilities to users with designated administrative privileges. It is also recommended to review logging configurations to ensure that sensitive data such as stack traces and internal paths are not included in logs accessible via API endpoints unless absolutely necessary for debugging purposes. Implementing an API gateway or reverse proxy can provide an additional layer of security by enforcing authentication and authorization policies at the network edge before requests reach the application logic, thereby reducing the attack surface even if application-level controls fail temporarily.