Microsoft Enhancing Entra ID Authentication
Microsoft is enhancing Entra ID authentication security by enforcing a stricter Content Security Policy (CSP) that blocks external script injection starting in mid-to-late October 2026. This change will prevent unauthorized scripts from executing during browser-based sign-ins. What’s Changing in Entra ID Authentication As part of Microsoft’s Secure Future Initiative , Entra ID will implement a hardened Content Security Policy (CSP) for sign-in pages hosted at login.microsoftonline.com . This update will: Block external script injection , including inline scripts from untrusted sources. Allow only scripts from Microsoft-trusted domains (e.g., Microsoft CDN). Mitigate cross-site scripting (XSS) and other injection-based attacks during authentication. This change does not affect Microsoft Entra External ID or non-browser-based sign-in experiences. What Admins Should Do To prepare for the rollout: Stop using browser extensions or tools that inject scripts into the En...