Pel fixed media manager security issue jb

Jorge Borrerorequested to merge
PEL-fixed_media_manager_security_issue_jb into 1.x.x

Media manager updates:

  • Prevents .php and .phtml files from being uploaded. (Javascript and PHP checks)
  • Prevents, when getting file details, download and delete the use of "../" in the filename which previously allowed any file in the server to be affected.

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