Microsoft Entra ID: Retirement of custom CSS positioning properties in custom branding

Microsoft Entra ID will retire support for custom CSS positioning properties in company branding starting October 2026 to enhance security and phishing resistance. Existing users must remove these properties by then, as no migration path exists. Branding elements remain visible but may revert to default placement. What and Why To align with Microsoft’s Secure Future Initiative (SFI) and its focus on identity security and phishing resistance, Microsoft is enhancing Microsoft Entra custom branding to support more secure, reliable, and consistent sign in experiences. Beginning in October 2026, Microsoft Entra ID will retire support for custom CSS positioning properties used in custom branding. Full retirement of all custom CSS is planned for a future date, and additional notice will be provided before that change occurs. This update helps further reduce opportunities for deceptive or misleading sign in page layouts and supports trusted sign in experiences that better protect users from phishing attacks while maintaining brand customization capabilities. <brollout schedule< b=””></brollout schedule<> General Availability (Worldwide and GCC): Beginning in October 2026 and expected to complete by late November 2026 Impact on Your Organization Who is affected Administrators managing Microsoft Entra ID company branding Organizations currently using custom CSS positioning properties in company branding Organizations that do not use custom CSS positioning properties as of July 21, 2026, are not affected and will not be able to use these properties going forward Microsoft Entra External ID tenants are not affected Platforms/Services Microsoft Entra ID Custom branding for sign-in experiences (including company branding and branding themes) Web-based branded sign-in pages What will happen Existing tenants that currently use custom CSS positioning properties can continue using them until October 2026. Beginning on October 26, 2026, the affected positioning properties will no longer be honored and will stop functioning. Branding elements on branded sign-in pages such as logos, images, and text will remain visible but may revert to their default placement and appearance. There is no supported migration path or replacement for the retired positioning properties. Organizations that do not already use custom CSS positioning properties cannot create new dependencies on these properties. New Microsoft Entra […]

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