Veeva CRM Sandbox - Salesforce Winter '27 Release Issues

[in progress]
Salesforce has provided an additional update on the Cosmos theme. Unfortunately, changing the Theme back does not resolve the issues. We are continuing to work with Salesforce on a resolution.From Salesforce:"At this time, we don't have an alternative workaround to offer for orgs where the theme is already correct and non-adjustable. We understand this is impacting your customer's business processes, and we're treating this as a priority given the number of affected customers. We don't have a fix ETA yet, but we'll continue to push for updates and will let you know as soon as we have more concrete guidance including whether a documented Known Issue will be published."

We have identified an unplanned UVC resulting from the Salesforce Winter ’27 release. Salesforce has confirmed that this behavior is unexpected and plans to publish a Known Issue within the next day.

Salesforce has confirmed:

“We’ve confirmed there’s a regression where existing sandbox orgs upgraded to Winter ’27 are unexpectedly switching from the Lightning Blue theme (SLDS 1) to the newer Salesforce Cosmos theme (SLDS 2). This is happening even without any admin action.”


We will continue working with Salesforce on a resolution. In the meantime, Admins can change the theme setting back to SLDS 1 to restore the expected UI experience.

We are continuing to work with Salesforce on this issue. Salesforce is looking at why different Orgs are behaving differently when attempting to use the Soap API.For users that need to login to an iPad, you can select the "Use Custom Domain" from the login screen. As we continue to work with Salesforce to investigate this issue, we have identified a solution that has been successful in some Salesforce orgs for Integration Users.Salesforce provides additional information on the relevant API authentication permission here:Salesforce DevelopersCreate a new permission set with the Use Any API Auth system permission enabled, and then assign that permission set to the affected user.Please note that the Use Any API Auth permission is only available when the permission set is created with the License value set to None.In some Salesforce orgs, assigning the permission set may fail with the following error:"Can't assign permission set test_permission_set2 to user Veeva Admin. The user license doesn't allow the permission: Use Any API Auth"We have observed that this workaround can be applied successfully in some orgs but not others, even when the affected users have the same license type. We are continuing to work with Salesforce to better understand the difference in behavior across orgs.

We are continuing to work with Salesforce to resolve the issue introduced with their Winter ’27 release that is preventing users from logging in from iPad.Additionally, we have identified another issue affecting users in Sandbox, where some buttons are missing from the Account page. Salesforce has confirmed that this issue is also related to their Winter ’27 release, and we are actively working with them to resolve it.

Veeva CRM team has noticed that some users are unable to login on Sandbox orgs and/or use Multichannel activities like Approved Email.. This is due to Salesforce's Winter '27 update. Veeva has raised a ticket with Salesforce to address this issue.