Re-implement strict mimetype validation
When merging https://review.typo3.org/c/Packages/TYPO3.CMS/+/62366 we've lost the strict mimetype validation (https://review.typo3.org/c/Packages/TYPO3.CMS/+/60617). We have to re-implement it.
Updated by Bjoern Jacob about 1 month ago
- TYPO3 Version changed from 10 to 11
We have to check this issue. There was some work on the mime typing. The mentioned configuration is not included for example in https://github.com/TYPO3/typo3/blob/master/typo3/sysext/form/Configuration/Yaml/FormElements/ImageUpload.yaml