CVE-2026-53709 in MCP Context Forge
Summary
by MITRE • 10/13/2026
MCP Context Forge is an MCP gateway and administrative platform. Prior to 1.0.2, mcpgateway/config.py and .env.example ship a known JWT_SECRET_KEY, while verify_jwt_token() accepts HS256 tokens signed with that key and get_current_user() creates a platform administrator when the token subject matches PLATFORM_ADMIN_EMAIL and REQUIRE_USER_IN_DB is false. A remote unauthenticated attacker can therefore mint accepted administrator tokens without a database account. While the vulnerable signing key remains configured and the platform-admin bootstrap remains enabled, forged access survives password rotation, account deletion, and session revocation, allowing administrative disclosure, modification, and service disruption. This issue is fixed in version 1.0.2.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified in MCP Context Forge prior to version 1.0.2 represents a critical failure in authentication logic stemming from the use of hardcoded cryptographic secrets combined with insecure administrative bootstrap mechanisms. The core technical flaw lies within the configuration files, specifically mcpgateway/config.py and .env.example, which ship with a known JWT_SECRET_KEY by default. This static secret allows any external actor to independently compute valid JSON Web Tokens signed using the HS256 algorithm without possessing legitimate credentials or access to the system's private key material. The vulnerability is exacerbated by the implementation of the verify_jwt_token() function, which accepts these tokens if they are correctly signed with the known public default key, and get_current_user(), which grants immediate platform administrator privileges when a token subject matches PLATFORM_ADMIN_EMAIL under specific conditions where REQUIRE_USER_IN_DB is set to false.
This combination of factors creates an authentication bypass that allows remote unauthenticated attackers to mint accepted administrator tokens at will. The operational impact is severe because the forged access persists even after standard security remediation attempts such as password rotation, account deletion, or session revocation. Since the attacker controls the signing key used for validation, they can continuously generate new valid administrative tokens regardless of changes made by system administrators within the application layer. This effectively nullifies traditional identity management controls and allows for persistent unauthorized access to sensitive platform data and configuration settings.
From a classification perspective, this vulnerability aligns with CWE-798: Use of Hard-coded Credentials, as it involves the use of static secrets that are distributed with the software product rather than being generated dynamically or managed securely during deployment. Additionally, the exploitation technique maps directly to MITRE ATT&CK T1078: Valid Accounts, specifically the sub-category of Default Accounts, where an adversary leverages built-in credentials to gain initial access and escalate privileges. The ability to bypass database validation checks further highlights a failure in input validation and identity verification processes, which are fundamental components of secure software architecture as defined by OWASP guidelines for authentication mechanisms.
To mitigate this vulnerability, immediate action is required to upgrade MCP Context Forge to version 1.0.2 or later, where the hardcoded secret has been removed and the insecure bootstrap logic has been addressed. In environments that cannot immediately patch due to operational constraints, administrators should manually override the JWT_SECRET_KEY in their configuration files with a cryptographically strong random value generated using secure entropy sources. Furthermore, it is critical to ensure that REQUIRE_USER_IN_DB remains enabled or that alternative strict validation controls are implemented to prevent token subjects from automatically mapping to administrative roles without proper database verification. Regular auditing of default configurations and disabling any unnecessary bootstrap features in production environments will significantly reduce the attack surface associated with this type of authentication bypass.