Discourse-jira is a Discourse plugin allows Jira projects, issue types, fields and field options will be synced automatically. An administrator user can make an SSRF attack by setting the Jira URL to an arbitrary location and enabling the `discourse_jira_verbose_log` site setting. A moderator user could manipulate the request path to the Jira API, allowing them to perform arbitrary GET requests using the Jira API credentials, potentially with elevated permissions, used by the application.
The code does not sufficiently manage its control flow during execution, creating conditions in which the control flow can be modified in unexpected ways.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.