CVE-2026-53977 in OpenChamber
Summary
by MITRE • 08/06/2026
OpenChamber 1.11.7 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to terminate the server process by sending a POST request to the /api/system/shutdown endpoint, which is registered before the authentication middleware in the Express route handler chain. Attackers can exploit the route registration order in bootstrap-runtime.js to reach the shutdown handler before auth middleware executes, causing denial of service to all active AI coding sessions and locking out legitimate remote users regardless of whether UI_PASSWORD is configured.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/06/2026
The vulnerability in OpenChamber 1.11.7 represents a critical authentication bypass flaw that fundamentally undermines the application's security model. This issue stems from improper route registration order within the Express.js framework where the shutdown endpoint /api/system/shutdown is mapped before the authentication middleware is applied. The bootstrap-runtime.js file contains the flawed routing logic that allows unauthenticated requests to directly access sensitive system endpoints without proper authorization checks. This misconfiguration creates a pathway for malicious actors to exploit the application's core functionality through simple HTTP POST requests, effectively bypassing all authentication mechanisms regardless of configuration settings including UI_PASSWORD enforcement.
The technical implementation of this vulnerability demonstrates a classic route registration order flaw that violates fundamental security principles. When Express.js processes routes sequentially, the order in which endpoints are defined determines their execution priority within the middleware chain. In this case, the shutdown handler is registered before the authentication middleware, creating an exploitable gap where any remote attacker can reach the endpoint without first passing through authorization checks. The vulnerability specifically targets the application's process management functionality, allowing attackers to terminate server processes remotely and cause immediate system downtime.
The operational impact of this vulnerability extends beyond simple denial of service to encompass complete system lockout and disruption of legitimate user sessions. When an attacker successfully exploits this flaw, they can terminate active AI coding sessions that are currently in progress, effectively destroying ongoing work and disrupting productivity for all users. The denial of service affects not only individual connections but the entire application infrastructure, as the shutdown command terminates core server processes that maintain user sessions and system operations. This vulnerability particularly impacts collaborative environments where multiple users rely on continuous access to AI coding assistance, making the disruption more severe than typical single-user denial of service attacks.
Security mitigation strategies for this vulnerability must address both the immediate route registration flaw and implement comprehensive access control measures. Organizations should immediately restructure the application's middleware chain to ensure authentication occurs before any sensitive endpoint handlers are registered. The fix requires modifying bootstrap-runtime.js to properly order route definitions such that authentication middleware executes before system management endpoints become accessible. Additionally, implementing principle of least privilege controls for API endpoints and adding request validation checks can prevent exploitation attempts. This vulnerability aligns with CWE-284 Access Control Issues and maps to ATT&CK technique T1499.004 for system shutdown/reboot attacks, emphasizing the need for proper authorization enforcement in web applications.
The broader implications of this vulnerability highlight the critical importance of secure coding practices in modern web applications, particularly those involving AI systems and collaborative environments. Applications that handle sensitive user data or provide continuous service availability must implement robust access control mechanisms that cannot be bypassed through simple configuration errors. The flaw demonstrates how seemingly minor implementation details in middleware ordering can create catastrophic security vulnerabilities, affecting not just individual users but entire organizational workflows that depend on uninterrupted service availability. This type of vulnerability serves as a reminder that authentication bypass issues remain among the most dangerous security flaws due to their potential for widespread system compromise and operational disruption.