LightRAG/docs/archives/action_plan/multitenant-audit/07-security-fixes-implemented.md

Security Fixes Implementation Report

Date: November 29, 2025
Status: ✅ COMPLETED

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Summary

All identified security vulnerabilities from the multi-tenant audit have been implemented and tested. The fixes maintain backward compatibility through configurable flags.

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Implemented Fixes

SEC-001: Remove Global RAG Fallback ✅

Files Modified:

• lightrag/api/config.py - Added MULTI_TENANT_STRICT_MODE flag
• lightrag/api/dependencies.py - Updated get_tenant_context_optional() to enforce strict mode
• lightrag/api/routers/document_routes.py - Updated get_tenant_rag() to block fallback in strict mode
• lightrag/api/routers/query_routes.py - Updated get_tenant_rag() to block fallback in strict mode

Configuration:

# Enable strict multi-tenant mode (default: true)
export LIGHTRAG_MULTI_TENANT_STRICT=true

Behavior:

• When LIGHTRAG_MULTI_TENANT_STRICT=true: Requests without tenant context are rejected with HTTP 400
• When LIGHTRAG_MULTI_TENANT_STRICT=false: Falls back to global RAG (backward compatible)

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SEC-002: Remove Admin User Bypass ✅

Files Modified:

• lightrag/api/config.py - Added SUPER_ADMIN_USERS configuration
• lightrag/services/tenant_service.py - Replaced hardcoded "admin" bypass with configurable super-admin list

Configuration:

# Configure super-admin users (comma-separated list)
export LIGHTRAG_SUPER_ADMIN_USERS="admin@company.com,superuser"

Behavior:

• Only users explicitly listed in LIGHTRAG_SUPER_ADMIN_USERS get super-admin access
• Empty by default (no super-admins)
• Case-insensitive matching

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SEC-003: Make user_id Required ✅

Files Modified:

• lightrag/api/config.py - Added REQUIRE_USER_AUTH flag
• lightrag/tenant_rag_manager.py - Updated to enforce user_id when flag is enabled

Configuration:

# Require user authentication for tenant access (default: true)
export LIGHTRAG_REQUIRE_USER_AUTH=true

Behavior:

• When LIGHTRAG_REQUIRE_USER_AUTH=true: Requests without user_id are rejected with PermissionError
• When LIGHTRAG_REQUIRE_USER_AUTH=false: Allows anonymous access (backward compatible)

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WUI-001: Clear localStorage on Logout ✅

Files Modified:

• lightrag_webui/src/stores/state.ts - Added tenant context clearing in logout() function

Changes:

logout: () => {
  localStorage.removeItem('LIGHTRAG-API-TOKEN');
  // NEW: Clear tenant context on logout
  localStorage.removeItem('SELECTED_TENANT');
  localStorage.removeItem('SELECTED_KB');
  // ...
}

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WUI-002: Better Error Handling ✅

Files Modified:

• lightrag_webui/src/api/tenant.ts - Removed fake fallback data on API errors

Changes:

• fetchTenantsPaginated() now throws errors instead of returning fake default tenant
• fetchTenants() now throws errors instead of returning fake default tenant
• UI components can now properly display error states

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WUI-003: Validate Tenant Context ✅

Files Modified:

• lightrag_webui/src/api/client.ts - Added tenant context validation in Axios interceptor

Changes:

// Endpoints that require tenant context
const TENANT_REQUIRED_ENDPOINTS = [
  '/documents',
  '/query',
  '/graph',
  '/knowledge-bases',
]

// Block requests without tenant context for required endpoints
if (requiresTenantContext(config.url) && (!hasTenantContext || !hasKBContext)) {
  throw new axios.Cancel('Please select a tenant and knowledge base...');
}

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Configuration Summary

Variable	Default	Description
LIGHTRAG_MULTI_TENANT_STRICT	true	Enforce tenant context on all data endpoints
LIGHTRAG_REQUIRE_USER_AUTH	true	Require user authentication for tenant access
LIGHTRAG_SUPER_ADMIN_USERS	""	Comma-separated list of super-admin usernames

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Test Results

Test Suite	Tests	Result
test_multitenant_e2e.py	32	✅ PASSED
test_tenant_security.py	11	✅ PASSED
test_multi_tenant_backends.py	37	✅ PASSED
test_tenant_storage_phase3.py	22	✅ PASSED
TOTAL	102	✅ ALL PASSED

WebUI Build: ✅ PASSED

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Migration Guide

For Existing Single-Tenant Deployments

If you want to maintain the old behavior (no tenant enforcement):

export LIGHTRAG_MULTI_TENANT_STRICT=false
export LIGHTRAG_REQUIRE_USER_AUTH=false

For New Multi-Tenant Deployments

The defaults are secure out of the box:

# These are the defaults, no need to set
export LIGHTRAG_MULTI_TENANT_STRICT=true
export LIGHTRAG_REQUIRE_USER_AUTH=true

# Optionally configure super-admins
export LIGHTRAG_SUPER_ADMIN_USERS="admin@example.com"

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Security Verification Checklist

Check	Status
Global RAG fallback blocked in strict mode	✅
Admin bypass removed	✅
User authentication enforced	✅
Tenant context cleared on logout	✅
API errors propagated to UI	✅
Client-side tenant validation	✅
All tests pass	✅
WebUI builds successfully	✅

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Remaining Recommendations

1. Enable PostgreSQL RLS - Add database-level row security as defense-in-depth
2. Add Audit Logging - Log cross-tenant access attempts for security monitoring
3. Rate Limiting - Implement per-tenant rate limiting to prevent abuse
4. Use httpOnly Cookies - Consider moving tokens from localStorage to httpOnly cookies