"Microsoft will introduce a new Content Security Policy for Microsoft Entra ID in October 2026. The measure is intended to prevent cross-site scripting. Microsoft advises organizations not to use browser extensions or tools that inject code into the Entra ID sign-in experience. If you follow this recommendation, you don't need to do anything. The experience will remain unchanged. Do you use tools that inject code? Then you will need to switch to alternatives."
"To determine the impact in advance, administrators can go through sign-in flows with the developer console open. Any violations will then appear in red. Microsoft emphasizes that specific teams or individuals should test their own flows, as violations are only visible in their own login attempts. Stronger protection against attacks The tech company will only allow scripts from trusted Microsoft domains during login. Unauthorized or injected code will not run."
Microsoft will enforce a Content Security Policy for Microsoft Entra ID sign-ins starting October 2026, blocking injected code in browser-based login experiences. Only scripts served from trusted Microsoft domains will be allowed during login, preventing unauthorized or injected code from running and reducing cross-site scripting (XSS) risks. Tools, browser extensions, or other code-injecting utilities will stop working and must be replaced with alternatives, though users will still be able to log in. Administrators can pre-test sign-in flows by opening the developer console to see violations in red, and specific teams should validate their own login attempts. The change applies to login.microsoftonline.com; Entra External ID is unaffected.
Read at Techzine Global
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