fix the XSS in user pages

src/libpoketube/init/pages-account.js

@@ -105,9 +105,16 @@ app.get("/account-create", async function (req, res) {
 });
 
 app.get("/my-acc", async function (req, res) {
-        var userid = req.query.ID
-       var userSubs =  db.get(`user.${userid}.subs`)
-       renderTemplate(res, req, "account-me.ejs", { userid, userSubs });
+    var userid = req.query.ID;
 
+    // Check if userid is more than 6 characters
+    if (userid.length > 6) {
+        return res.status(400).json({ error: "IDs can be 6 characters max" });
+    }
+
+    var userSubs =  db.get(`user.${userid}.subs`);
+
+    renderTemplate(res, req, "account-me.ejs", { userid, userSubs });
 });
+
 };