Microsoft Authenticator to Enforce Number Matching
As a way to enhance the security of MFA, Microsoft will require users to authorize login attempts by entering a numeric code into the Microsoft Authenticator app.
MFA reduces account takeover by requiring another proof of identity, limiting damage from stolen passwords; protect fallback and recovery paths too.
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Background for this topic.
MFA requires a user to prove identity with at least two different factor types: something they know, have, or are. It limits account takeover when a password is exposed, but protection depends on the factors and their implementation; two passwords are not independent factors, and a one-time code delivered by SMS is generally weaker than a phishing-resistant credential.
Attackers may steal or relay one-time codes through phishing, trigger repeated push prompts to induce approval, exploit weak enrollment or account-recovery processes, or hijack an authenticated session after MFA succeeds. Prefer phishing-resistant methods such as FIDO2/WebAuthn security keys or platform credentials for sensitive access, protect enrollment and recovery as strongly as login, restrict weaker fallbacks, and monitor unusual authentication activity. MFA reduces risk but does not replace endpoint, session, or privileged-access controls.
As a way to enhance the security of MFA, Microsoft will require users to authorize login attempts by entering a numeric code into the Microsoft Authenticator app.
Mandatory measure against attackers who spam MFA folks into submission Microsoft is hoping to curb a growing threat to multi-factor authentication (MFA) by enforcing a number-matching step for those using Microsoft Authenticator push notifications when signing into services.…
Microsoft has started enforcing number matching in Microsoft Authenticator push notifications to fend off multi-factor authentication (MFA) fatigue attacks. [...]
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