Microsoft Entra ID must enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-270208	SRG-APP-000065	ENTR-ID-000140	SV-270208r1085616_rule	2025-03-17	1

Description
By limiting the number of failed login attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute forcing, is reduced. Limits are imposed by locking the account. Satisfies: SRG-APP-000345

ℹ️ Check
Verify Entra ID is configured to enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period. 1. Sign in to the Microsoft Entra admin center as at least an Authentication Policy Administrator. 2. Browse to Identity >> Protection >> Authentication methods >> Password protection. 3. Verify the Lockout Threshold has been set to "3" and Lockout duration is set to "900" or more. If Entra ID is not configured to enforce the limit of three consecutive invalid logon attempts with a lockout period of 15 minutes, this is a finding.

ℹ️ Check

Verify Entra ID is configured to enforce the limit of three consecutive invalid logon attempts by a user during a 15-minute time period. 1. Sign in to the Microsoft Entra admin center as at least an Authentication Policy Administrator. 2. Browse to Identity >> Protection >> Authentication methods >> Password protection. 3. Verify the Lockout Threshold has been set to "3" and Lockout duration is set to "900" or more. If Entra ID is not configured to enforce the limit of three consecutive invalid logon attempts with a lockout period of 15 minutes, this is a finding.

✔️ Fix
To configure account lockout settings, complete these steps: 1. Sign in to the Microsoft Entra admin center as at least an Authentication Administrator. 2. Browse to Identity >> Protection >> Authentication methods >> Password protection. 3. Set the Lockout threshold to "3". 4. Set the Lockout duration to "900" (15 minutes).