Security: Settings update allows cross-user modification through untrusted user_id in body

[tuanaiseo]

Problem

update_settings accepts a full Settings object and uses settings.user_id to select/update records. Without auth binding, a caller can overwrite another user's settings by submitting their user_id.

Severity: high
File: src/magentic_ui/backend/web/routes/settingsroute.py

Solution

Remove user_id from client-controlled update payloads. Resolve user identity from authentication middleware and enforce updates only for the authenticated principal.

Changes

• src/magentic_ui/backend/web/routes/settingsroute.py (modified)

Testing

• Existing tests pass
• Manual review completed
• No new warnings/errors introduced

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