Apache CouchDB 1.7.0 / 2.x < 2.1.1 - Remote Privilege Escalation

Due to differences in the Erlang-based JSON parser and JavaScript-based JSON parser, it is possible in Apache CouchDB before 1.7.0 and 2.x before 2.1.1 to submit users documents with duplicate keysfor 'roles' used for access control within the database, including the special case 'admin' role, th...