Administration - Installation - Core: Re: Security fixes in ILIAS 5.3

I see #28865 and #28867 in release_5-3 branch.

Cherry-picked the missing one:

git cherry-pick -X ignore-all-space c4eda166332a52e64d8685366637941d7ccef330

Thanks for bringing this to our attention.

082ef40f033601895a70b2354effdb0b3124273c from the 5.4 branch should also be "pickable".