sbassett added a comment.

  In T329121#8620995 <https://phabricator.wikimedia.org/T329121#8620995>, 
@ItamarWMDE wrote:
  
  > Unfortunately, it seems like we cannot do this as these headers were 
requested by the WMF security team it seems. In addition, this might expose us 
to some forms of clickjacking 
<https://owasp.org/www-community/attacks/Clickjacking> attacks, where other 
embedding sites will be able to steal some information from the embedded page.
  
  This is all correct, and why we'd discourage a revert of the status quo or, 
at the very least, likely rate it as at least a {icon exclamation-triangle 
color=yellow} **medium risk**.
  
  > We might be able to try and set a `Content-Security-Policy` header with a 
`frame-ancestors` directive set to the domain of the MOOC. But I would still 
defer to advice from the WMF  Security Team (tagging @sbassett here since they 
are the only contact I have in the team so far)
  
  This is likely feasible, if it doesn't interfere with any potential 
`X-Frame-Options: deny` headers, and if the source list is kept to a minimum of 
//absolutely necessary// URLs that the #security-team 
<https://phabricator.wikimedia.org/tag/security-team/> could review and assign 
any potential risk ratings.

TASK DETAIL
  https://phabricator.wikimedia.org/T329121

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To: sbassett
Cc: sbassett, ItamarWMDE, Lucas_Werkmeister_WMDE, mickeybarber, Envlh, 
Aklapper, Astuthiodit_1, karapayneWMDE, Invadibot, Devnull, maantietaja, 
Akuckartz, Michael, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, 
LawExplorer, _jensen, rosalieper, Scott_WUaS, Wong128hk, Luke081515, 
Wikidata-bugs, aude, Bawolff, Grunny, csteipp, Mbch331, Jay8g, Krenair
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