SSO vs MFA: What’s the Difference and Do You Need Both?
Single sign-on (SSO) and multi-factor authentication (MFA) solve different problems. SSO lets people sign in once and reach all their applications, so there are fewer passwords to manage. MFA adds a second proof of identity, such as an app prompt or security key, so a stolen password alone is not enough. You do not have to choose. Most organisations should use both, with MFA enforced at the SSO sign-in point.
Here is what each does, where they differ and how to set them up so they work together.
What SSO does
With SSO, a person logs in once to an identity provider. That provider then passes a trusted token to each application, using standards such as SAML or OpenID Connect, so the person is not asked for another password.
The benefits are practical:
- Fewer passwords, which means less reuse and fewer reset requests
- One place to switch off access when someone leaves
- One log of who signed in to what
- A faster start for new joiners
Read more on our single sign-on page.
What MFA does
MFA requires two or more kinds of proof before granting access. Typically that is something you know (a password), something you have (a phone or security key) and sometimes something you are (a fingerprint or face scan).
It works because passwords get stolen through phishing, reuse and data leaks. With MFA, a stolen password on its own does not open the account. See our multi-factor authentication page for the options we deploy.
SSO vs MFA at a glance
| SSO | MFA | |
|---|---|---|
| What it reduces | Number of passwords and sign-ins | Risk from stolen or guessed passwords |
| What it adds | One controlled sign-in point | An extra proof of identity |
| Helps users by | Making login faster | Making login safer (sometimes slower) |
| Helps IT by | Central control and offboarding | Stronger authentication |
| Weakness on its own | One stolen login opens many apps | Prompts for every app can annoy users |
Why using SSO without MFA is risky
SSO concentrates access. That is its strength, and also its weakness. If one password opens ten applications and nothing else protects the login, an attacker who steals that password gets ten applications.
So the SSO sign-in should always be protected by MFA. Do that and every connected application is protected at once.
Why using MFA without SSO gets tiring
If every application asks for its own prompt, people get fatigued. Attackers know this and sometimes flood users with approval requests, hoping someone taps “approve” to make them stop. Putting MFA behind SSO means one considered prompt instead of many, and you can add smarter rules, such as asking for MFA only when the device, location or risk looks unusual.
How to combine them
- Put your applications behind SSO, starting with email and the most-used cloud apps.
- Enforce MFA at the SSO gateway for everyone, and for every admin account without exception.
- Use conditional access. Require stronger proof for risky sign-ins, such as a new device or an unusual country.
- Prefer phishing-resistant methods where you can, such as security keys or passkeys. See passwordless authentication.
- Plan for outages. Keep a protected break-glass account in case the identity provider is unavailable.
- Cover legacy apps. Older applications that cannot use SSO need a gateway or another approach. Do not leave them as the weak link.
Common mistakes
- Enabling SSO but leaving MFA optional
- Protecting email and VPN with MFA but not business portals
- Using SMS codes everywhere when stronger methods are available
- Forgetting admin accounts, which need extra protection through privileged access management
- Not testing what happens if the SSO service is down
Where this fits in the bigger picture
SSO and MFA are two parts of identity and access management, alongside role-based access control and access reviews. UAE frameworks such as the UAE Information Assurance Regulation and the DESC Information Security Regulation expect controlled and strong authentication. Which rules apply depends on your sector.
Need help choosing and deploying?
We design SSO and MFA together so users get one simple login and you get strong control. Talk to our team and we will map out a rollout for your applications.
Related Reading
More from our blog
- Employee Offboarding Access Checklist: Closing Every Door When Someone Leaves
- PAM vs IAM: What’s the Difference and Which Do You Need?
Related services