[2.4.5-p12] CORS Errors Prevent Page Builder Content Updates (Production Mode)

[anasshl]

Preconditions and environment

Environment:

• Magento Version: 2.4.6-p7
• Web Server: Nginx
• PHP Version: 8.2
• Page Builder extension enabled.
• Store Mode: Production (issue occurs only in this mode).

Quality Patches:

• The issue persists even after applying quality patches ACSD-49628 and ACSD-59514.

Steps to reproduce

• Log in to the Magento 2 Admin panel.
• Navigate to Content > Pages.
• Click on Add New Page or select an existing CMS page and click Edit.
• Use the Page Builder to add a new content block or edit an existing block.
• Make any changes to the content (e.g., adding text, images, or other elements).
• Click the Save button to update the page.

Expected result

• The page content should be saved successfully without any errors.

Actual result

• The Page Builder changes fail to save.
• The browser console logs CORS-related errors, specifically showing:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://domain.com/static/adminhtml/Magento/backend/en_US/requirejs/require.js. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 200.

Additional information

Note: This problem occurs only in production mode, the Page Builder works fine in developer mode.

We have attempted the following workarounds without success:

• We have applied quality patches ACSD-49628 and ACSD-59514, and we deployed the production environment .but the issue persists.
• Adding CORS headers to Nginx configuration.
• Clearing caches (both browser and Magento).

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
• 3. Add Area: XXXXX label to the ticket, indicating the functional areas it may be related to.
• 4. Verify that the issue is reproducible on 2.4-develop branch
  Details

  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
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• 5. Add label Issue: Confirmed once verification is complete.
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[devchris79]

It sounds like the Nginx configuration isn't right or is being ignored.

Have you tried the wide open configuration to test?

[lcw-media]

Same for me, seems no config error. I use apache.

Adding this into apache vhost config fixed it:
Header set Access-Control-Allow-Origin "*"

But as it worked fine before this is not a good solution

The reason for this behavior can be found in this file:

vendor/magento/module-csp/Plugin/AddDefaultPropertiesToGroupPlugin.php

        if ($integrity && $integrity->getHash()) {
            $properties['attributes']['integrity'] = $integrity->getHash();
            $properties['attributes']['crossorigin'] = 'anonymous';
        }

After setting the integrity, CORS will block the requested file.

So when integrity with crossorigin is set, the Access-Control-Allow-Origin header also have to be set.

[engcom-Bravo]

Hi @anasshl,

Thanks for your reporting and collaboration.

We have verified the issue in Latest 2.4-develop instance and the issue is reproducible.Kindly refer the screenshots.

Steps to reproduce

• Log in to the Magento 2 Admin panel.
• Navigate to Content > Pages.
• Click on Add New Page or select an existing CMS page and click Edit.
• Use the Page Builder to add a new content block or edit an existing block.
• Make any changes to the content (e.g., adding text, images, or other elements).
• Click the Save button to update the page.

The Page Builder changes fail to save.

Hence Confirming the isuue.

Thanks.