check before: 2026-10-15
Product:
Entra, SharePoint
Platform:
Online, World tenant
Status:
Change type:
Feature update, User impact, Admin impact
Links:
Details:
Summary:
Microsoft Entra ID will enhance authentication security by enforcing a Content Security Policy that blocks external script injection, allowing only trusted Microsoft scripts. This rollout begins mid-October 2026, affecting browser-based sign-ins on login.microsoftonline.com, with no impact on Entra External ID tenants.
Details:
Introduction
As part of Microsoft's Secure Future Initiative, we're updating our Content Security Policy for the Microsoft Entra ID sign-in experience. This change adds an extra layer of protection by allowing only scripts from trusted Microsoft domains to run during authentication, blocking unauthorized or injected external code. This proactive measure helps safeguard users against threats like cross-site scripting (XSS), further strengthening security for your organization.
When this will happen
General Availability (Production/Worldwide only):
Rollout begins mid-October 2026
Expected completion by late October 2026
Periodic communications will be sent closer to release.
Change Category:
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Scope:
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Release Phase:
Created:
2025-12-04
updated:
2025-12-04
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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summary for non-techies**
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Direct effects for Operations**
Blocked Browser Extensions
Browser extensions or tools that inject code into the sign-in page will stop working, potentially disrupting user workflows and authentication processes.
- roles: End Users, IT Support
- references: https://aka.ms/entracontentsecuritypolicy, https://techcommunity.microsoft.com/blog/microsoft-entra-blog/enhance-protection-of-microsoft-entra-id-authentication-by-blocking-external-scr/4435200
User Experience Disruption
Users relying on specific scripts for enhanced functionality during sign-in may experience a degraded authentication experience, leading to frustration and potential delays.
- roles: End Users, System Administrators
- references: https://www.microsoft.com/msrc/blog/2025/09/why-xss-still-matters-msrcs-perspective-on-a-25-year-old-threat, https://content-security-policy.com/script-src/
Increased Support Requests
The change may lead to an increase in support requests from users facing issues with sign-in due to blocked scripts, impacting IT support resources.
- roles: IT Support, Help Desk Staff
- references: https://www.microsoft.com/trust-center/security/secure-future-initiative?msockid=22346ecb805f631739b27a6e81726266, https://content-security-policy.com/nonce/
Configutation Options**
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Opportunities**
Improved Security Awareness Training
With the implementation of the new Content Security Policy (CSP), there is an opportunity to enhance security awareness training for employees, particularly focusing on the risks of cross-site scripting (XSS) and the importance of using trusted tools and extensions. This can foster a culture of security and vigilance among users.
- next-steps: Develop a training module that educates employees about XSS threats, the importance of CSP, and best practices for secure sign-in. Schedule regular training sessions and provide resources for ongoing education.
- roles: IT Security Manager, HR Training Coordinator, Compliance Officer
- references: https://techcommunity.microsoft.com/blog/microsoft-entra-blog/enhance-protection-of-microsoft-entra-id-authentication-by-blocking-external-scr/4435200" target="_blank" rel="nofollow noopener noreferrer">https://techcommunity.microsoft.com/blog/microsoft-entra-blog/enhance-protection-of-microsoft-entra-id-authentication-by-blocking-external-scr/4435200, https://www.microsoft.com/msrc/blog/2025/09/why-xss-still-matters-msrcs-perspective-on-a-25-year-old-threat
Streamlined Authentication Process
By enforcing a CSP that blocks external scripts, the authentication process can become more streamlined and faster, as it reduces the overhead caused by loading unnecessary third-party scripts. This can enhance user experience by minimizing delays during sign-in.
- next-steps: Monitor the authentication performance metrics post-implementation to evaluate the speed improvements. Gather user feedback to assess their experience with the new sign-in process and make adjustments as necessary.
- roles: IT Operations Manager, User Experience Designer, System Administrator
- references: https://aka.ms/entracontentsecuritypolicy, https://content-security-policy.com/nonce/
Reduction in Security Incidents
The enhanced security measures from the CSP can lead to a significant reduction in security incidents related to script injections and XSS attacks. This can save costs associated with incident response and recovery, thereby improving overall IT operations efficiency.
- next-steps: Implement a monitoring system to track security incidents related to authentication and assess the impact of the CSP. Regularly review and report on the reduction in incidents to demonstrate the effectiveness of the policy change.
- roles: IT Security Analyst, Risk Management Officer, CIO
- references: https://www.microsoft.com/trust-center/security/secure-future-initiative?msockid=22346ecb805f631739b27a6e81726266, https://techcommunity.microsoft.com/blog/microsoft-entra-blog/enhance-protection-of-microsoft-entra-id-authentication-by-blocking-external-scr/4435200" target="_blank" rel="nofollow noopener noreferrer">https://techcommunity.microsoft.com/blog/microsoft-entra-blog/enhance-protection-of-microsoft-entra-id-authentication-by-blocking-external-scr/4435200
Potentional Risks**
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IT Security**
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explanation for non-techies**
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