check before: 2026-03-30
Product:
SharePoint
Platform:
Developer, Online, US Instances, Web, World tenant
Status:
Launched
Change type:
User impact, Admin impact, Retirement
Links:
Details:
Summary:
The legacy SharePoint Online CDN domain publiccdn.sharepointonline.com will be retired by late April 2026. Update all hardcoded references to the new domain public-cdn.sharepointonline.com to avoid 404 errors. Validate changes before March 31, 2026, to ensure uninterrupted access to SharePoint resources.
Details:
[Introduction]
As part of ongoing service modernization, Microsoft has migrated the hosting of SharePoint Online static assets to the Microsoft Azure Front Door (AFD) content delivery network (CDN), using the new domain public-cdn.sharepointonline.com. This migration was previously announced in MC1066155 and completed in July 2025.
This message is a follow-up notice to retire the legacy CDN domain publiccdn.sharepointonline.com. After this rollout completes, content referenced via the legacy domain will no longer be accessible, and users will receive 404 errors when trying to access resources hosted on the legacy domain.
[When this will happen:]
General Availability (Worldwide): Rollout begins March 31, 2026, and completes by late April 2026.
Change Category:
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Scope:
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Release Phase:
General Availability
Created:
2025-11-12
updated:
2025-11-12
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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linked item details
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summary for non-techies**
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Direct effects for Operations**
Access Issues Due to 404 Errors
Users will encounter 404 errors when trying to access resources that are still referencing the legacy CDN domain after its retirement.
- roles: End Users, Developers
- references: https://learn.microsoft.com/sharepoint/dev/spfx/extensions/get-started/hosting-extension-from-office365-cdn#update-your-solution-project-for-the-cdn-urls, https://learn.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview
Service Disruption
If hardcoded references are not updated, applications and scripts will fail to load necessary SharePoint resources, leading to service disruptions.
- roles: Developers, Admins
- references: https://learn.microsoft.com/sharepoint/dev/spfx/extensions/get-started/hosting-extension-from-office365-cdn#update-your-solution-project-for-the-cdn-urls, https://learn.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview
Increased Support Tickets
The retirement of the legacy CDN domain may lead to an increase in support tickets from users experiencing access issues, impacting IT support resources.
- roles: IT Support, End Users
- references: https://learn.microsoft.com/sharepoint/dev/spfx/extensions/get-started/hosting-extension-from-office365-cdn#update-your-solution-project-for-the-cdn-urls, https://learn.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview
Compliance Risks
Failure to update configurations may lead to compliance risks if users are unable to access necessary resources for their work, affecting productivity.
- roles: Admins, Compliance Officers
- references: https://learn.microsoft.com/sharepoint/dev/spfx/extensions/get-started/hosting-extension-from-office365-cdn#update-your-solution-project-for-the-cdn-urls, https://learn.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview
User Experience Degradation
Users may experience a degraded experience due to broken links and inaccessible resources, leading to frustration and decreased productivity.
- roles: End Users, Developers
- references: https://learn.microsoft.com/sharepoint/dev/spfx/extensions/get-started/hosting-extension-from-office365-cdn#update-your-solution-project-for-the-cdn-urls, https://learn.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview
Configutation Options**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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Last updated 4 weeks ago ago
