Winter ’21 - "Enable Secure Static Resources for Lightning Components" causes a CORS issue for static resources loaded from an aura component
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Known Issues · Fixed

Winter ’21 - "Enable Secure Static Resources for Lightning Components" causes a CORS issue for static resources loaded from an aura component

API , Platform , Lightning , Winter 21

Last updated 2020-11-19 ·Reference W-8267201 ·Reported By 111 users

Fixed - Winter '21 Patch 12.0

Summary
Enabling Release Update "Enable Secure Static Resources for Lightning Components" causes a CORS issue for static resources loaded from an aura component

Repro
Steps to repro

In a Winter 21 org (Org A):

Create a simple js static resource that prints a string to the console
Add it to a managed package and upload

In a Winter 21 org (Org B):

Install the managed package
Create a lightning component with the static resource from the package

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes" access="global" >
<ltng:require scripts="{!$Resource.namespace__resourcename}" afterScriptsLoaded="{!c.scriptsLoaded}" />
<aura:attribute name="feedName" type="String"/>
</aura:component>

3. Add the component to a lightning component tab

4. Open the browser console and open the new tab. The tab should open and the resource loaded.

5. Turn on the CRUC, Enable Secure Static Resources for Lightning Components from release updates setup page. (Its not auto-enabled until Spring 21)

6. If we open the tab now we'll see a CORS error.

Workaround
None

Reported By (111)

John Eischens Bartłomiej Jasiński Melissa Rainboldt vinathi varakantham Jake Richter Greg Stone Michael Schirger Robert Köstner Florian Lungu Besnik Gashi Mario Lukica Mark Klinski Zachary Strong Brijesh Popat Ismail BOUHADDA Julio Pescador Team IT Client Anil Srikantham Tripti Sharma Aleksei Murashin Bob Myers Vinay Medishetty Anil Kumar D Chris Woolcott Falk Lehmann Eugen Stiopan Ioana Cioca George Yoshida 翔 永山 Huyen York Khamla Phimmachack Ortal Kazum Waverly Krystaponis Annie McElrath Chris Stern Josh Cutler Jordan Garrett Anna Wiersema Luzie Baumgart Janelle O'Neil Blake Curtis Sean Allen Amy Dewaal Matt Brown Jessica Mazariegos Emily Davis Thomas Payne Karen Waldschmitt Ken McElrath J. Tingle JD Bell Jason Spangler JAYA SREE GAZULA Keiji Otsubo Jay Peters Andrew Rintoul Lucille Vu Sebastien Laruée System Admin E.J. Wilburn Jesse Grimm Jeff Farnsworth Brandon Coston Justin Richmond Mauricio Del Rio Akash Jain Susan Harris 由佳 高橋 Sreedhar Karukonda Faiza Naz 花陽子 鈴木 Hiroshi Yoshita SergeyPauk Pauk Alex Jr Ryanthony Baronda Amit Kumar Chandni Gupta Lucas McDonald Bernd Mareth Maximilian Wittig Christian Szandor Knapp Tim Moore Devendra Patel Abdul Basith Jeff Kranz Naga Alapati Ralph Ma Warren Wade Jason Dodds Hiroki Oguri Stephen Jenkins Joel Mansford Damian Tomczik Wesley Wei Sam Sysum Omar Rodriguez Craig White Callum Hurry Mikhail Radchenko Daichi Mizoguchi Kazuhiro Watanabe Ross Goldberg Vijay Kumar Singh Michael Northorp Pradeep M Anthony Day Alex Martin Dan Sunderland Sarah Lovatt Umang Thakkar Anshul Sharma

Is it Fixed?

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