Several REST interfaces vulnerable to XSRF

Several REST web services are vulnerable to XSRF, allowing malicious web pages to execute them under the context of a logged in users browser.

It's understood that JIRA REST interfaces are typically protected against XSRF based on the content-type they consume. The following methods are vulnerable as they consume content types that can be submitted by a standard HTML form:

• MediaType.TEXT_PLAIN
• MediaType.MULTIPART_FORM_DATA
• MediaType.APPLICATION_FORM_URLENCODED
• MediaType.WILDCARD

The severity of these vulnerabilities vary from adding voters/voting on issues, to updating project and user avatars.