CVE-2026-57206 in simplechat
Summary
by MITRE • 07/16/2026
SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.241.206, several plugin validation routes in application/single_app/plugin_validation_endpoint.py, including `POST /api/admin/plugins/test-instantiation`, `GET /api/admin/plugins/health-check/<plugin_name>`, `POST /api/admin/plugins/repair/<plugin_name>`, and `POST /api/plugins/validate`, relied on @swagger_route(security=get_auth_security()) documentation without enforcing @login_required, @user_required, or @admin_required at runtime, allowing unauthenticated or unauthorized clients to invoke plugin validation, health, and repair behavior. This issue is fixed in version 0.241.206.
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Analysis
by VulDB Data Team • 07/16/2026
The vulnerability described represents a critical authorization bypass flaw in SimpleChat's plugin validation system that undermines the application's security model and exposes core administrative functionality to unauthenticated access. This weakness affects multiple endpoints within the application's single_app/plugin_validation_endpoint.py file, specifically targeting routes designed for privileged operations including plugin instantiation testing, health monitoring, repair functions, and general validation processes. The flaw stems from a documentation-centric approach where swagger route decorators were used to define security requirements without implementing actual runtime authorization checks, creating a dangerous gap between documented security policies and enforced access controls.
The technical implementation of this vulnerability demonstrates a fundamental failure in the application's authentication middleware architecture, where decorator-based security annotations are not properly translated into executable authorization logic. The absence of login_required, user_required, or @admin_required decorators at runtime means that any client capable of reaching these endpoints can execute privileged operations without proper credential verification or access rights validation. This architectural oversight allows attackers to bypass the intended security boundaries and potentially manipulate plugin configurations, perform health checks on system components, or initiate repair operations that could compromise system integrity or availability.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential system compromise through manipulation of core application plugins. Attackers could exploit these endpoints to test malicious plugin instantiations, monitor system health status for reconnaissance purposes, or execute repair procedures that might alter system configurations in ways that benefit the attacker. The exposure of plugin validation functionality creates opportunities for privilege escalation attacks and could enable adversaries to gain deeper access to the application's backend systems, particularly given that these routes appear to be designed for administrative use cases requiring elevated privileges. This vulnerability directly violates the principle of least privilege and undermines the security model that should protect sensitive system operations.
Security controls for this issue should focus on implementing proper runtime authentication checks across all administrative endpoints, ensuring that authorization decorators are enforced rather than merely documented. The fix in version 0.241.206 addresses the core problem by enforcing actual authentication requirements at runtime, preventing unauthorized access to privileged plugin validation functions. Organizations should implement comprehensive security testing procedures including automated vulnerability scanning and manual penetration testing to identify similar authorization bypass issues in their applications. The vulnerability aligns with CWE-863 (Incorrect Authorization) and represents a clear violation of ATT&CK technique T1078 (Valid Accounts) as it allows unauthorized access through legitimate administrative endpoints without proper credential verification.
This type of vulnerability highlights the importance of runtime security enforcement over documentation-only approaches and demonstrates how seemingly minor architectural oversights can create significant security risks. The fix should include comprehensive logging of all plugin validation activities to enable detection of unauthorized access attempts, along with proper error handling that prevents information disclosure through failed authentication responses. Organizations using similar applications should conduct thorough security reviews of their endpoint authorization mechanisms to ensure that documented security requirements are properly implemented and enforced at runtime rather than relying solely on API documentation for access control enforcement.