TYPO3 Core

How to reproduce¶

#. Be sure to have CKEditor and not the old rtehtmlarea)
#. Create a standard Text content element
#. Write some text and add a link to it, "external", enter something like http://www.google.ch/?q=whatever&foo=bar
#. Show the source, it is properly HTML encoded and shows href="http://www.google.ch/?q=whatever&foo=bar"
#. Show the page in frontend, link now double-encoded parameter => href="http://www.google.ch/?q=whatever&foo=bar"

See &foo=bar instead of &foo=bar?