Major Entra Change Requiring Action by Oct 26, 2026

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The major Microsoft Entra changes tied to October 26 (based on current authoritative sources) fall into one clear category: retirement of custom CSS and layout properties used in Entra ID branded sign‑in pages. This is a security‑driven change under Microsoft’s Secure Future Initiative (SFI), and IT admins must take action before October 26, 2026. 

Major Entra Change Requiring Action by Oct 26, 2026

Microsoft is retiring a large set of CSS layout and positioning properties used in Entra ID custom branding.
If your organization uses custom CSS for sign‑in branding, this change directly affects you.

Properties being retired

These include (not exhaustive here, but confirmed by Microsoft):

  • offset, offset-path, offset-distance

  • margin-block, margin-inline and all their start/end variants

  • order, grid-area, grid-column, grid-row

  • isolation, overflow-x, overflow-y, overflow-block, overflow-inline

  • content-visibility, clip, mask, mask-image, -webkit-mask, -webkit-mask-image

Why Microsoft is doing this

Microsoft found that malicious actors were abusing these layout properties to impersonate branded sign‑in pages, enabling phishing attacks.
This retirement is part of the Secure Future Initiative (SFI) to harden identity infrastructure.

What happens on October 26, 2026

  • Any retired CSS property will stop functioning.

  • Your branded elements will revert to default positions and behavior.

  • You must remove or replace these properties before the deadline to avoid broken layouts.

Next phase

Microsoft will fully retire all custom CSS in Entra ID by late 2027.

Required Admin Actions Before Oct 26

Microsoft advises:

  1. Download your current custom CSS file from Entra ID branding settings.

  2. Identify any use of the retired properties.

  3. Remove or replace them with supported alternatives.

  4. Test your sign‑in experience to ensure branding still appears correctly.

  5. Notify users and stakeholders about any visual changes.

Other Entra Changes Happening Around October (Not Oct 26‑specific)

These are important but not tied to the Oct 26 deadline:

Windows Hello for Business & macOS Platform SSO become standalone MFA factors

Rollout begins early October 2026, completing late November.
No admin configuration required.

Microsoft retiring SMS/voice MFA delivery

  • Passkeys become default for SMS/voice users: Sept 1, 2026

  • Microsoft stops providing SMS/voice MFA delivery: Feb 1, 2027

Summary: What matters for Oct 26

Area

Deadline

Impact

Custom CSS retirement (specific properties)

Oct 26, 2026

Must remove retired CSS properties or branding breaks

Full custom CSS retirement

Late 2027

All custom CSS removed

WHfB & macOS PSSO as standalone MFA

Early Oct–Nov 2026

MFA behavior changes, fewer prompts

SMS/voice MFA retirement

Feb 1, 2027

Must migrate to passkeys or telecom provider


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