GHSA-6xj3-274m-4mvg: InvoicePlane: Guest user IDOR in quote approval and rejection

InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. Prior to 1.7.2-beta-1, guest users can approve or reject quotes belonging to any client, not just their assigned clients. The approve() and reject() methods in the Guest Quotes controller, application/modules/guest/controllers/Quotes.php, call approvequotebyid($quoteid) and rejectquotebyid($quoteid) directly without the wherein('ipquotes.clientid', $this->userclients) scoping that sibling methods use. A guest user assigned to one client can change another client's quote status by supplying sequential integer quoteid values, and emailquotestatus() also sends notification emails. Additionally, generatepdf() calls markviewed($quoteid) before checking the client scope, allowing a guest user to mark another client's quote as viewed. These issues are fixed in version 1.7.2-beta-1 and the subsequent stable version 1.7.2.