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Introduces Content-Security-Policy HTTP header check on fileadmin/ resources. This can be seen as follow-up up to TYPO3-CORE-SA-2020-006 and TYPO3-PSA-2019-010 now actively analyzing this HTTP header and letting users know in reports module and system environment check of the Install Tool. Resolves: #92835 Releases: master, 10.4, 9.5 Change-Id: I53028ae36c9195082993ee89d630efa7b555c547 Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66627 Tested-by: TYPO3com <noreply@typo3.com> Tested-by: Markus Klein <markus.klein@typo3.org> Tested-by: Oliver Hader <oliver.hader@typo3.org> Reviewed-by: Markus Klein <markus.klein@typo3.org> Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
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