[41604] SETTINGS REST API Fix: Validate parameters in wp/v2/settings endpoint to prevent incorrect responses#8914
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Trac: https://core.trac.wordpress.org/ticket/41604
Problem
The /wp/v2/settings endpoint currently accepts POST requests with empty bodies or invalid parameters and incorrectly returns the site settings instead of proper error responses.
Current behavior (incorrect):
POST /wp/v2/settings with empty body → Returns settings (should be 400)
POST /wp/v2/settings with {"invalid_param": "value"} → Returns settings (should be 400)
POST /wp/v2/settings with {"title": "New", "invalid_param": "value"} → Returns settings (should be 400)
Root Cause
The WordPress REST API args validation system only validates known parameters defined in the schema. When no settings are registered with show_in_rest => true, or when unknown parameters are provided, the validation framework doesn't reject the request, allowing the update_item() callback to execute and return settings data.
Solution
Added parameter validation in the update_item() method of
WP_REST_Settings_Controllerto:Reject empty request bodies - POST/PUT/PATCH requests must contain parameters
Reject invalid parameters - Only allow parameters that correspond to registered settings
Return appropriate HTTP 400 errors with descriptive messages
Expected Behavior After Fix