- POST /ticket_dependencies: verify user can access both the source
ticket and the target ticket before creating a dependency
- DELETE by ticket IDs: verify user can access source ticket; also
validate dependency_type against the allowed whitelist
- DELETE by dependency_id: look up dependency's ticket before deletion
and verify user can access it, preventing IDOR
- custom_fields.php: validate json_decode returns an array on POST/PUT;
add http_response_code(400) to all error responses
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>