"Tim Starling" posted a comment on MediaWiki.r110900.
URL: http://www.mediawiki.org/wiki/Special:Code/MediaWiki/110900#c30576

Commit summary for MediaWiki.r110900:

Revert r110321: introduces an XSS vulnerability because FormatJson::encode() 
does not prevent the termination of CDATA sections when JavaScript is embedded 
in HTML.

Tim Starling's comment:

Actually there is a difference between \x3c and \u003c: \x3c is not allowed in 
JSON, although it is allowed in JavaScript. Neither json_decode() nor 
Services_JSON::decode() recognises \x3c. 

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