Cross-site request forgery (CSRF) vulnerability in jsonrpc.cgi in Bugzilla 3.5.x and 3.6.x before 3.6.8, 3.7.x and 4.0.x before 4.0.4, and 4.1.x and 4.2.x before 4.2rc2 allows remote attackers to hijack the authentication of arbitrary users for requests that use the JSON-RPC API.