GHSA-fm2f-4339-4p2f: Flowise: Missing Authorization on Execution Update Endpoint

Flowise has a missing authorization vulnerability in its execution update endpoint (`PUT /api/v1/executions/:id`). Unlike other execution endpoints that check user permissions, the update endpoint allows any authenticated user to modify any execution record, enabling privilege escalation (gaining higher-level access than intended) where a low-privileged user can change execution data and results.