This is the easiest challenge in this CTF. There is only one file, "index.js" in this challenge. app.get('/flag', needAuth, (req, res) => { if (req.session.username !== 'admin') { flash(req, 'only admin can read the flag'); return res.redirect('/'); } return res.render('flag', { chall_name: CHALL_NAME, flash: getFlash(req), flag: FLAG }); }); When you enter "/flag" endpoint with admin session, y..