Upcoming changes to classic publishing sites, classic user-created pages and custom scripting in SharePoint Online

🚨 The Signal: Microsoft is deprecating classic SharePoint publishing sites and user-created pages, disabling custom scripting by March 2027 and making existing pages read-only by October 2028. This enhances security by removing legacy, less secure customization methods.

The Impact

SharePoint administrators and content owners are affected, reducing the attack surface by eliminating insecure custom scripting.

• SharePoint Admins: Must plan and execute migration of classic sites to modern SharePoint.
• Content Owners: Classic pages will become read-only, requiring content migration or recreation.
• Security Teams: Reduced attack surface from deprecated custom scripting.
• Developers: Custom scripting in classic pages will cease to function for new content.

The Action

1. Identify all classic publishing sites and user-created pages within your SharePoint Online tenant.
2. Assess the usage and criticality of identified classic sites and pages.
3. Develop a modernization plan to migrate classic content and functionality to modern SharePoint experiences.
4. Implement modern SharePoint sites and pages, leveraging out-of-the-box features or modern development frameworks.
5. Communicate changes and migration timelines to affected content owners and end-users.

Domain: SharePoint · Impact: medium · Workload: SharePoint