ApostropheCMS is an open-source Node.js content management system. In versions up to and including 4.30.0, "apos.util.set()" traverses dot-notation paths without sanitizing "__proto__", allowing an authenticated editor to write arbitrary values to "Object.prototype" via the "$pullAll" patch operator. A confirmed gadget in "publicApiCheck()" causes this to bypass authorization on all piece-type REST API endpoints for every subsequent unauthenticated request, for the lifetime of the Node.js process. As of time of publication, no known patched versions are available.