Improve Security by Requiring User Access to Apex Classes Invoked by Flow (Critical Update)
Where: This change applies to Lightning Experience and Salesforce Classic in Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions. This change applies only to flows executed in Lightning runtime.
When: This critical update begins auto-activating on December 2, 2019.
How: From Setup, enter Critical Updates in the Quick Find box. Then select Critical Updates. For Require User Access to Apex Classes Invoked by Flow, click Activate.
Admins might need to adjust profiles or permission sets for users who run flows that invoke Apex classes. A flow stops working if it invokes an Apex class that the running user doesn’t have access to.