The Content-Security-Policy directive 'frame-ancestors' does not support the source expression ''unsafe-inline''

[minhluan259]

Preconditions (*)

1. Magento 2.4.2-p1 with sample data
2. Chrome v91

Steps to reproduce (*)

1. Open console in Google Chrome (F12)
2. Reload the homepage

Expected result (*)

1. Console without error

Actual result (*)

1. Console is displaying error:
   The Content-Security-Policy directive 'frame-ancestors' does not support the source expression ''unsafe-inline''

How to solve 'frame-ancestors' issue?

[m2-assistant]

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[mrtuvn]

Seem you have add whitelist csp to your external resources. Otherwises browser will raise error like that
Ex: https://github.com/magento/magento2/blob/2.4-develop/app/code/Magento/Csp/etc/csp_whitelist.xml

[TheRealHunzik]

@magento give me 2.4-develop instance

[magento-deployment-service]

Hi @TheRealHunzik. Thank you for your request. I'm working on Magento instance for you.

[magento-deployment-service]

Hi @TheRealHunzik, here is your Magento Instance: https://417250d6ae3dad506caa89980d793a88-2-4-develop.instances.magento-community.engineering
Admin access: https://417250d6ae3dad506caa89980d793a88-2-4-develop.instances.magento-community.engineering/admin_c253
Login: b17d726b
Password: 7814a27bf253

[minhluan259]

@mrtuvn it's not about whitelist issue, because on default luma theme we do not have any iframe (object, embed, ... https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors ) tags.
the problem is 'unsafe-inline' only support by 'script-src'
and 'frame-ancestors' does not support the source expression ''unsafe-inline''
https://content-security-policy.com/unsafe-inline/

[m2-assistant]

Hi @engcom-Echo. Thank you for working on this issue.
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[engcom-Echo]

Hi Minhluan259,

Please refer the devdocs link - https://devdocs.magento.com/guides/v2.4/extension-dev-guide/security/content-security-policies.html
For CSP related information.

Hope this link will help you resolve this issue that you are getting.

Let me know , if the information does not suffice your query.

Thanks

[minhluan259]

@engcom-Echo please read this:

@mrtuvn it's not about whitelist issue, because on default luma theme we do not have any iframe (object, embed, ... https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors ) tags.
the problem is 'unsafe-inline' only support by 'script-src'
and 'frame-ancestors' does not support the source expression ''unsafe-inline''
https://content-security-policy.com/unsafe-inline/

[refueledinc]

I'm in agreement with @minhluan259 - the issue is happening because frame-ancestors does not support unsafe-inline.

The issue is reported as an error in console starting in Chrome v91.

[refueledinc]

I have not fully tested this, but changing line https://github.com/magento/magento2/blob/2.4-develop/app/code/Magento/Csp/etc/config.xml#L109 to <inline>0</inline> appears to resolve the issue for me. Be sure to run php bin/magento c:c after the change.