GHSA-HH95-5XM5-V8V7 TYPO3 CMS Possible Insecure Deserialization in Extbase Request Handling

It has been discovered that request handling in Extbase can be vulnerable to insecure deserialization. User submitted payload has to be signed with a corresponding HMAC-SHA1 using the sensitive TYPO3 encryptionKey as secret - invalid or unsigned payload is not deserialized. However, since sensiti...