LetterNine Blog
You Turned On MFA. Here's Why You're Not Done Yet.
Think multi-factor authentication means your logins are safe? It's a great start, but a few common gaps can still leave the door open. Here's what to check.
MFA is a great start, not the finish line
You turned on multi-factor authentication (MFA): a second check beyond your password, like a code from an app. Good move. It stops a lot of attacks cold.
But we see the same thing all the time. A business flips on MFA, breathes a sigh of relief, and assumes the job is done. It isn’t quite.
Think of MFA as a deadbolt on the front door. Helpful. But it doesn’t matter much if a window is open around the back. Let’s walk through the windows that often stay open.
Gap 1: Reused and weak passwords
MFA adds a second lock, but your password is still the first one. If your team reuses the same password across sites, one leak somewhere else can expose you here.
Weak passwords (think “Summer2024”) are easy to guess. Reused ones show up in breach lists attackers buy and test.
The fix: Give your team a password manager - a secure app that creates and stores a unique, strong password for every account. Nobody has to remember them. Everyone uses better passwords without trying.
Gap 2: Shared accounts
One login that five people use feels convenient. It’s also a blind spot.
When something goes wrong, you can’t tell who did what. And when someone leaves, that shared password often sticks around long after they’re gone.
The fix: Give people their own accounts wherever you can. Where a shared login is truly unavoidable, store it in the password manager so you control access and can change it fast.
Gap 3: MFA fatigue
Here’s a sneaky one. Some MFA setups send a push notification - tap “Approve” to log in. Attackers who already have your password will spam those prompts, hoping you tap “Approve” just to make them stop.
That’s MFA fatigue. One tired tap, and they’re in.
The fix: Use number-matching or app-based codes instead of a simple tap. Number-matching shows a number on screen that you type into the app, so a random prompt can’t be approved by accident. Where possible, move away from text-message (SMS) codes, which are easier to intercept.
Gap 4: Old accounts nobody turned off
Staff change. Vendors come and go. Trial accounts get created and forgotten. Each old, active login is an open door you’ve stopped watching.
The fix: Run a quarterly account clean-up. Four times a year, review who still has access, turn off accounts for people who’ve left, and remove logins you no longer need. It takes an afternoon and closes a lot of doors.
The short version
MFA is doing real work for you. Pair it with these four habits and you close the gaps most small businesses miss:
- A password manager for the whole team
- A unique password for every account
- Number-matching or app-based MFA instead of SMS where possible
- A quarterly account clean-up
That’s the difference between one lock and a secure building.
Want a second set of eyes?
If you’re not sure where your gaps are, we’re happy to take a look. We’ll review your current MFA and account setup and give you a plain-English list of what to tighten up. No pressure, no jargon.
Schedule a quick call and we’ll walk through it together.