For future reference please send security issues you find to firstname.lastname@example.org.
Hope I won't 🙂
I have opened 2 tabs in a browser.
1 window, I have opened the new Topic button, and composing.
Another window, I just clicked the logout button.
I came back to the first window, and added some more content and I'm able to post the data.
We should have middle ware to handle all the requests for authentication.
Please submit a bug.
When you hit F5 in the first window you'll be logged out.