Add MediaWiki 1.18 post-release change notes, sourced from https://www.mediawiki.org/wiki/Release_notes/1.18
Bug:T213714
Change-Id: I2bea0ca7cb02d32fd24392fa167351851062ccb1
== MediaWiki 1.18 ==
+== MediaWiki 1.18.6 ==
+2012-11-29
+
+This is a maintenance and security release of the MediaWiki 1.18 branch
+
+=== Changes since 1.18.5 ===
+* ([[bugzilla:40995|bug 40995]]) Prevent session fixation in Special:UserLogin
+(CVE-2012-5391)
+* ([[bugzilla:41400|bug 41400]]) Prevent linker regex from exceeding PCRE
+backtrack limit
+* Localisation updates
+* Increase permitted runtime for testParserTest
+* ([[bugzilla:36179|bug 36179]]) Unquote 'null' for PostgreSQL.
+
== MediaWiki 1.18.5 ==
2012-08-30