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Spring / Spring7 Intermediate to Advanced Interview questions

What is the difference between Spring Security 6 and Spring Security 7?

Spring Security 7 (paired with Spring Framework 7) makes several changes that go beyond a routine dependency bump.

AspectSpring Security 6Spring Security 7
Multi-factor authNo first-class supportNative MFA authorization managers
OAuth2 password grantPresent, discouragedRemoved entirely
PKCE / dynamic registrationOpt-in on the Authorization ServerEnabled by default
Null safetySpring's own annotationsJSpecify
SAML2 / KerberosLegacy dependency chainsModernized, legacy deps removed

The MFA support is the headline feature - it was one of the most long-requested capabilities in the project's history - while the OAuth2 defaults changes reflect a broader push toward secure-by-default configuration rather than secure-if-configured-correctly.

Which long-requested feature became native in Spring Security 7?
What happened to the OAuth2 password grant in Spring Security 7?

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