Microsoft and Google are removing client-side XSLT libraries from their browsers due to security concerns and reduced maintenance of legacy components. XSLT is the technology that powers Mosaic forms in the browser. Without it, forms will not display — users will see a blank screen instead of the form content.
If you are using Mosaic 26.1, no action is needed. The 26.1 release has already been updated so that browser-based XSLT is no longer required.
Who is affected
This affects all Mosaic users who are not yet on version 26.1 and use Microsoft Edge or Google Chrome to access Mosaic forms. Both internal users and external customers using Mosaic are impacted.
Key dates
Browser | What is changing | When |
Microsoft Edge 147 | XSLT is disabled by default. Can be re-enabled via group policy | 30 April 2026 |
Google Chrome | XSLT functionality removed entirely | November 2026 |
⚠️Important: If you are not on Mosaic 26.1 and use Microsoft Edge, action is needed before 30 April 2026 to avoid disruption.
What happens if no action is taken
When a user opens a Mosaic form in a browser that no longer supports XSLT, the form will not display. The user will see a blank screen and all form data will be inaccessible.
All Mosaic forms are affected. This poses a significant business disruption risk if no mitigation is implemented.
What you need to do
If you are on Mosaic 26.1
No action is needed. The changes to remove the dependency on browser-based XSLT have already been implemented in this release.
If you are not on Mosaic 26.1 and use Microsoft Edge
You need to re-enable XSLT in Edge 147 using a group policy setting. Microsoft have provided instructions for re-enabling this functionality at group policy level. Contact your IT team to apply this change before 30 April 2026.
📌Note: This is a temporary workaround. Upgrading to Mosaic 26.1 is the permanent solution.
If you use Google Chrome
Chrome will remove XSLT support entirely in November 2026. Separate communication will follow with specific guidance closer to this date. Upgrading to Mosaic 26.1 before November 2026 will ensure no disruption.
What Access is doing
In response to the de-support by both Google Chrome and Microsoft Edge, the Mosaic 26.1 release has been updated so that XSLT functionality in the browser is no longer needed. Customers on Mosaic 26.1 are fully protected from these browser changes.