By Rabia Noureen
Publication Date: 2026-09-30 18:07:00
Key Takeaways:
- Microsoft will enforce stricter CSP rules on Entra ID sign-in pages starting in October 2026.
- Third-party tools that rely on script injection may stop functioning after the change.
- Organizations should test authentication workflows and identify affected tools before enforcement begins.
Organizations increasingly rely on Microsoft Entra ID as the gateway to cloud services, but some security, monitoring, and customization tools inject scripts directly into Microsoft-hosted sign-in pages. These tools can add functionality, but script injection creates an additional attack surface that could be abused by malicious actors through techniques such as cross-site scripting (XSS) or unauthorized code execution during authentication.
To reduce this risk, Microsoft will begin enforcing stricter Content Security Policy (CSP) rules on Entra ID sign-in pages in October 2026. Once enabled, only…